Merge branch '4.4'

* 4.4:
  [Cache] fix cs
  Make tests support phpunit 8
  Allow Travis CI to build on PHP 7.4
  [DI] Allow dumping the container in one file instead of many files

.travis.yml

@@ -29,7 +29,6 @@ matrix:
           env: deps=high
         - php: 7.3
           env: deps=low
-
     fast_finish: true
 
 cache:
@@ -163,7 +162,7 @@ before_install:
               tfold ext.libsodium tpecl libsodium sodium.so $INI
           fi
 
-          tfold ext.apcu tpecl apcu-5.1.16 apcu.so $INI
+          tfold ext.apcu tpecl apcu-5.1.17 apcu.so $INI
           tfold ext.mongodb tpecl mongodb-1.6.0alpha1 mongodb.so $INI
           tfold ext.igbinary tpecl igbinary-2.0.8 igbinary.so $INI
           tfold ext.zookeeper tpecl zookeeper-0.7.1 zookeeper.so $INI

phpunit

@@ -7,8 +7,12 @@ if (!file_exists(__DIR__.'/vendor/symfony/phpunit-bridge/bin/simple-phpunit')) {
     echo "Unable to find the `simple-phpunit` script in `vendor/symfony/phpunit-bridge/bin/`.\nPlease run `composer update` before running this command.\n";
     exit(1);
 }
-if (\PHP_VERSION_ID >= 70000 && !getenv('SYMFONY_PHPUNIT_VERSION')) {
-    putenv('SYMFONY_PHPUNIT_VERSION=6.5');
+if (!getenv('SYMFONY_PHPUNIT_VERSION')) {
+    if (\PHP_VERSION_ID >= 70400) {
+        putenv('SYMFONY_PHPUNIT_VERSION=8.2');
+    } elseif (\PHP_VERSION_ID >= 70000) {
+        putenv('SYMFONY_PHPUNIT_VERSION=6.5');
+    }
 }
 putenv('SYMFONY_PHPUNIT_DIR='.__DIR__.'/.phpunit');
 require __DIR__.'/vendor/symfony/phpunit-bridge/bin/simple-phpunit';

src/Symfony/Bridge/Doctrine/Tests/ContainerAwareEventManagerTest.php

@@ -13,14 +13,17 @@ namespace Symfony\Bridge\Doctrine\Tests;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Doctrine\ContainerAwareEventManager;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\DependencyInjection\Container;
 
 class ContainerAwareEventManagerTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $container;
     private $evm;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->container = new Container();
         $this->evm = new ContainerAwareEventManager($this->container);

src/Symfony/Bridge/Doctrine/Tests/DependencyInjection/DoctrineExtensionTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bridge\Doctrine\Tests\DependencyInjection;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
@@ -21,12 +22,14 @@ use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
  */
 class DoctrineExtensionTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /**
      * @var \Symfony\Bridge\Doctrine\DependencyInjection\AbstractDoctrineExtension
      */
     private $extension;
 
-    protected function setUp()
+    private function doSetUp()
     {
         parent::setUp();
 

src/Symfony/Bridge/Doctrine/Tests/Form/ChoiceList/DoctrineChoiceLoaderTest.php

@@ -18,6 +18,7 @@ use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Doctrine\Form\ChoiceList\DoctrineChoiceLoader;
 use Symfony\Bridge\Doctrine\Form\ChoiceList\EntityLoaderInterface;
 use Symfony\Bridge\Doctrine\Form\ChoiceList\IdReader;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Form\ChoiceList\ArrayChoiceList;
 use Symfony\Component\Form\ChoiceList\Factory\ChoiceListFactoryInterface;
 
@@ -26,6 +27,8 @@ use Symfony\Component\Form\ChoiceList\Factory\ChoiceListFactoryInterface;
  */
 class DoctrineChoiceLoaderTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /**
      * @var ChoiceListFactoryInterface|\PHPUnit_Framework_MockObject_MockObject
      */
@@ -71,7 +74,7 @@ class DoctrineChoiceLoaderTest extends TestCase
      */
     private $obj3;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->factory = $this->getMockBuilder('Symfony\Component\Form\ChoiceList\Factory\ChoiceListFactoryInterface')->getMock();
         $this->om = $this->getMockBuilder('Doctrine\Common\Persistence\ObjectManager')->getMock();

src/Symfony/Bridge/Doctrine/Tests/Form/DataTransformer/CollectionToArrayTransformerTest.php

@@ -14,18 +14,21 @@ namespace Symfony\Bridge\Doctrine\Tests\Form\DataTransformer;
 use Doctrine\Common\Collections\ArrayCollection;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Doctrine\Form\DataTransformer\CollectionToArrayTransformer;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
  */
 class CollectionToArrayTransformerTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /**
      * @var CollectionToArrayTransformer
      */
     private $transformer;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->transformer = new CollectionToArrayTransformer();
     }

src/Symfony/Bridge/Doctrine/Tests/Form/EventListener/MergeDoctrineCollectionListenerTest.php

@@ -14,6 +14,7 @@ namespace Symfony\Bridge\Doctrine\Tests\Form\EventListener;
 use Doctrine\Common\Collections\ArrayCollection;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Doctrine\Form\EventListener\MergeDoctrineCollectionListener;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\Form\FormBuilder;
 use Symfony\Component\Form\FormEvent;
@@ -21,6 +22,8 @@ use Symfony\Component\Form\FormEvents;
 
 class MergeDoctrineCollectionListenerTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /** @var \Doctrine\Common\Collections\ArrayCollection */
     private $collection;
     /** @var \Symfony\Component\EventDispatcher\EventDispatcher */
@@ -28,7 +31,7 @@ class MergeDoctrineCollectionListenerTest extends TestCase
     private $factory;
     private $form;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->collection = new ArrayCollection(['test']);
         $this->dispatcher = new EventDispatcher();
@@ -37,7 +40,7 @@ class MergeDoctrineCollectionListenerTest extends TestCase
             ->getForm();
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $this->collection = null;
         $this->dispatcher = null;

src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypePerformanceTest.php

@@ -15,6 +15,7 @@ use Doctrine\ORM\Tools\SchemaTool;
 use Symfony\Bridge\Doctrine\Form\DoctrineOrmExtension;
 use Symfony\Bridge\Doctrine\Test\DoctrineTestHelper;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdEntity;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Form\Extension\Core\CoreExtension;
 use Symfony\Component\Form\Test\FormPerformanceTestCase;
 
@@ -23,6 +24,8 @@ use Symfony\Component\Form\Test\FormPerformanceTestCase;
  */
 class EntityTypePerformanceTest extends FormPerformanceTestCase
 {
+    use ForwardCompatTestTrait;
+
     const ENTITY_CLASS = 'Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdEntity';
 
     /**
@@ -50,7 +53,7 @@ class EntityTypePerformanceTest extends FormPerformanceTestCase
         ];
     }
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->em = DoctrineTestHelper::createTestEntityManager();
 

src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypeTest.php

@@ -28,6 +28,7 @@ use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdNoToStringEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleStringCastableIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleStringIdEntity;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Form\ChoiceList\View\ChoiceGroupView;
 use Symfony\Component\Form\ChoiceList\View\ChoiceView;
 use Symfony\Component\Form\Forms;
@@ -36,6 +37,8 @@ use Symfony\Component\Form\Tests\Extension\Core\Type\FormTypeTest;
 
 class EntityTypeTest extends BaseTypeTest
 {
+    use ForwardCompatTestTrait;
+
     const TESTED_TYPE = 'Symfony\Bridge\Doctrine\Form\Type\EntityType';
 
     const ITEM_GROUP_CLASS = 'Symfony\Bridge\Doctrine\Tests\Fixtures\GroupableEntity';
@@ -59,7 +62,7 @@ class EntityTypeTest extends BaseTypeTest
 
     protected static $supportedFeatureSetVersion = 304;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->em = DoctrineTestHelper::createTestEntityManager();
         $this->emRegistry = $this->createRegistryMock('default', $this->em);
@@ -89,7 +92,7 @@ class EntityTypeTest extends BaseTypeTest
         }
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         parent::tearDown();
 

src/Symfony/Bridge/Doctrine/Tests/ManagerRegistryTest.php

@@ -13,11 +13,14 @@ namespace Symfony\Bridge\Doctrine\Tests;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Doctrine\ManagerRegistry;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\ProxyManager\Tests\LazyProxy\Dumper\PhpDumperTest;
 
 class ManagerRegistryTest extends TestCase
 {
-    public static function setUpBeforeClass()
+    use ForwardCompatTestTrait;
+
+    private static function doSetUpBeforeClass()
     {
         if (!class_exists('PHPUnit_Framework_TestCase')) {
             self::markTestSkipped('proxy-manager-bridge is not yet compatible with namespaced phpunit versions.');

src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php

@@ -32,6 +32,7 @@ use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdStringWrapperNameEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\Type\StringWrapper;
 use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntityValidator;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
 
 /**
@@ -39,6 +40,8 @@ use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
  */
 class UniqueEntityValidatorTest extends ConstraintValidatorTestCase
 {
+    use ForwardCompatTestTrait;
+
     const EM_NAME = 'foo';
 
     /**
@@ -58,7 +61,7 @@ class UniqueEntityValidatorTest extends ConstraintValidatorTestCase
 
     protected $repositoryFactory;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->repositoryFactory = new TestRepositoryFactory();
 

src/Symfony/Bridge/PhpUnit/Tests/ClockMockTest.php

@@ -13,6 +13,7 @@ namespace Symfony\Bridge\PhpUnit\Tests;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\PhpUnit\ClockMock;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 
 /**
  * @author Dominic Tubach <dominic.tubach@to.com>
@@ -21,12 +22,14 @@ use Symfony\Bridge\PhpUnit\ClockMock;
  */
 class ClockMockTest extends TestCase
 {
-    public static function setUpBeforeClass()
+    use ForwardCompatTestTrait;
+
+    private static function doSetUpBeforeClass()
     {
         ClockMock::register(__CLASS__);
     }
 
-    protected function setUp()
+    private function doSetUp()
     {
         ClockMock::withClockMock(1234567890.125);
     }

src/Symfony/Bridge/PhpUnit/Tests/DnsMockTest.php

@@ -13,10 +13,13 @@ namespace Symfony\Bridge\PhpUnit\Tests;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\PhpUnit\DnsMock;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 
 class DnsMockTest extends TestCase
 {
-    protected function tearDown()
+    use ForwardCompatTestTrait;
+
+    private function doTearDown()
     {
         DnsMock::withMockedHosts(array());
     }

src/Symfony/Bridge/ProxyManager/Tests/LazyProxy/Instantiator/RuntimeInstantiatorTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bridge\ProxyManager\Tests\LazyProxy\Instantiator;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\ProxyManager\LazyProxy\Instantiator\RuntimeInstantiator;
 use Symfony\Component\DependencyInjection\Definition;
 
@@ -22,6 +23,8 @@ use Symfony\Component\DependencyInjection\Definition;
  */
 class RuntimeInstantiatorTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /**
      * @var RuntimeInstantiator
      */
@@ -30,7 +33,7 @@ class RuntimeInstantiatorTest extends TestCase
     /**
      * {@inheritdoc}
      */
-    protected function setUp()
+    private function doSetUp()
     {
         $this->instantiator = new RuntimeInstantiator();
     }

src/Symfony/Bridge/ProxyManager/Tests/LazyProxy/PhpDumper/ProxyDumperTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bridge\ProxyManager\Tests\LazyProxy\PhpDumper;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\ProxyManager\LazyProxy\PhpDumper\ProxyDumper;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\LazyProxy\PhpDumper\DumperInterface;
@@ -23,6 +24,8 @@ use Symfony\Component\DependencyInjection\LazyProxy\PhpDumper\DumperInterface;
  */
 class ProxyDumperTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /**
      * @var ProxyDumper
      */
@@ -31,7 +34,7 @@ class ProxyDumperTest extends TestCase
     /**
      * {@inheritdoc}
      */
-    protected function setUp()
+    private function doSetUp()
     {
         $this->dumper = new ProxyDumper();
     }

src/Symfony/Bridge/Twig/Tests/AppVariableTest.php

@@ -3,6 +3,7 @@
 namespace Symfony\Bridge\Twig\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\Twig\AppVariable;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Session\Flash\FlashBag;
@@ -10,12 +11,14 @@ use Symfony\Component\HttpFoundation\Session\Session;
 
 class AppVariableTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /**
      * @var AppVariable
      */
     protected $appVariable;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->appVariable = new AppVariable();
     }

src/Symfony/Bridge/Twig/Tests/Command/LintCommandTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bridge\Twig\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\Twig\Command\LintCommand;
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -21,6 +22,8 @@ use Twig\Loader\FilesystemLoader;
 
 class LintCommandTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $files;
 
     public function testLintCorrectFile()
@@ -95,12 +98,12 @@ class LintCommandTest extends TestCase
         return $filename;
     }
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->files = [];
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         foreach ($this->files as $file) {
             if (file_exists($file)) {

src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\Twig\Extension\FormExtension;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
 use Symfony\Bridge\Twig\Form\TwigRendererEngine;
@@ -22,6 +23,8 @@ use Twig\Loader\FilesystemLoader;
 
 class FormExtensionBootstrap3HorizontalLayoutTest extends AbstractBootstrap3HorizontalLayoutTest
 {
+    use ForwardCompatTestTrait;
+
     use RuntimeLoaderProvider;
 
     protected $testableFeatures = [
@@ -33,7 +36,7 @@ class FormExtensionBootstrap3HorizontalLayoutTest extends AbstractBootstrap3Hori
      */
     private $renderer;
 
-    protected function setUp()
+    private function doSetUp()
     {
         parent::setUp();
 

src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\Twig\Extension\FormExtension;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
 use Symfony\Bridge\Twig\Form\TwigRendererEngine;
@@ -22,6 +23,7 @@ use Twig\Loader\FilesystemLoader;
 
 class FormExtensionBootstrap3LayoutTest extends AbstractBootstrap3LayoutTest
 {
+    use ForwardCompatTestTrait;
     use RuntimeLoaderProvider;
 
     /**
@@ -29,7 +31,7 @@ class FormExtensionBootstrap3LayoutTest extends AbstractBootstrap3LayoutTest
      */
     private $renderer;
 
-    protected function setUp()
+    private function doSetUp()
     {
         parent::setUp();
 

src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\Twig\Extension\FormExtension;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
 use Symfony\Bridge\Twig\Form\TwigRendererEngine;
@@ -27,6 +28,7 @@ use Twig\Loader\FilesystemLoader;
  */
 class FormExtensionBootstrap4HorizontalLayoutTest extends AbstractBootstrap4HorizontalLayoutTest
 {
+    use ForwardCompatTestTrait;
     use RuntimeLoaderProvider;
 
     protected $testableFeatures = [
@@ -35,7 +37,7 @@ class FormExtensionBootstrap4HorizontalLayoutTest extends AbstractBootstrap4Hori
 
     private $renderer;
 
-    protected function setUp()
+    private function doSetUp()
     {
         parent::setUp();
 

src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\Twig\Extension\FormExtension;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
 use Symfony\Bridge\Twig\Form\TwigRendererEngine;
@@ -27,13 +28,14 @@ use Twig\Loader\FilesystemLoader;
  */
 class FormExtensionBootstrap4LayoutTest extends AbstractBootstrap4LayoutTest
 {
+    use ForwardCompatTestTrait;
     use RuntimeLoaderProvider;
     /**
      * @var FormRenderer
      */
     private $renderer;
 
-    protected function setUp()
+    private function doSetUp()
     {
         parent::setUp();
 

src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\Twig\Extension\FormExtension;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
 use Symfony\Bridge\Twig\Form\TwigRendererEngine;
@@ -24,6 +25,7 @@ use Twig\Loader\FilesystemLoader;
 
 class FormExtensionDivLayoutTest extends AbstractDivLayoutTest
 {
+    use ForwardCompatTestTrait;
     use RuntimeLoaderProvider;
 
     /**
@@ -33,7 +35,7 @@ class FormExtensionDivLayoutTest extends AbstractDivLayoutTest
 
     protected static $supportedFeatureSetVersion = 404;
 
-    protected function setUp()
+    private function doSetUp()
     {
         parent::setUp();
 

src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\Twig\Extension\FormExtension;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
 use Symfony\Bridge\Twig\Form\TwigRendererEngine;
@@ -23,6 +24,7 @@ use Twig\Loader\FilesystemLoader;
 
 class FormExtensionTableLayoutTest extends AbstractTableLayoutTest
 {
+    use ForwardCompatTestTrait;
     use RuntimeLoaderProvider;
 
     /**
@@ -32,7 +34,7 @@ class FormExtensionTableLayoutTest extends AbstractTableLayoutTest
 
     protected static $supportedFeatureSetVersion = 404;
 
-    protected function setUp()
+    private function doSetUp()
     {
         parent::setUp();
 

src/Symfony/Bridge/Twig/Tests/Extension/WebLinkExtensionTest.php

@@ -13,6 +13,7 @@ namespace Symfony\Bridge\Twig\Tests\Extension;
 
 use Fig\Link\Link;
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\Twig\Extension\WebLinkExtension;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
@@ -22,6 +23,8 @@ use Symfony\Component\HttpFoundation\RequestStack;
  */
 class WebLinkExtensionTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /**
      * @var Request
      */
@@ -32,7 +35,7 @@ class WebLinkExtensionTest extends TestCase
      */
     private $extension;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->request = new Request();
 

src/Symfony/Bridge/Twig/Tests/Extension/WorkflowExtensionTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bridge\Twig\Extension\WorkflowExtension;
 use Symfony\Component\Workflow\Definition;
 use Symfony\Component\Workflow\MarkingStore\MethodMarkingStore;
@@ -25,10 +26,12 @@ use Symfony\Component\Workflow\Workflow;
 
 class WorkflowExtensionTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $extension;
     private $t1;
 
-    protected function setUp()
+    private function doSetUp()
     {
         if (!class_exists(Workflow::class)) {
             $this->markTestSkipped('The Workflow component is needed to run tests for this extension.');

src/Symfony/Bundle/FrameworkBundle/Test/ForwardCompatTestTrait.php

@@ -0,0 +1,82 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\Test;
+
+use PHPUnit\Framework\TestCase;
+
+// Auto-adapt to PHPUnit 8 that added a `void` return-type to the setUp/tearDown methods
+
+if (method_exists(\ReflectionMethod::class, 'hasReturnType') && (new \ReflectionMethod(TestCase::class, 'tearDown'))->hasReturnType()) {
+    eval('
+    namespace Symfony\Bundle\FrameworkBundle\Test;
+
+    /**
+     * @internal
+     */
+    trait ForwardCompatTestTrait
+    {
+        private function doSetUp(): void
+        {
+        }
+
+        private function doTearDown(): void
+        {
+        }
+
+        protected function setUp(): void
+        {
+            $this->doSetUp();
+        }
+
+        protected function tearDown(): void
+        {
+            $this->doTearDown();
+        }
+    }
+');
+} else {
+    /**
+     * @internal
+     */
+    trait ForwardCompatTestTrait
+    {
+        /**
+         * @return void
+         */
+        private function doSetUp()
+        {
+        }
+
+        /**
+         * @return void
+         */
+        private function doTearDown()
+        {
+        }
+
+        /**
+         * @return void
+         */
+        protected function setUp()
+        {
+            $this->doSetUp();
+        }
+
+        /**
+         * @return void
+         */
+        protected function tearDown()
+        {
+            $this->doTearDown();
+        }
+    }
+}

src/Symfony/Bundle/FrameworkBundle/Test/KernelTestCase.php

@@ -23,7 +23,7 @@ use Symfony\Contracts\Service\ResetInterface;
  */
 abstract class KernelTestCase extends TestCase
 {
-    use TestCaseSetUpTearDownTrait;
+    use ForwardCompatTestTrait;
 
     protected static $class;
 
@@ -39,7 +39,7 @@ abstract class KernelTestCase extends TestCase
 
     protected static $booted;
 
-    protected function doTearDown(): void
+    private function doTearDown()
     {
         static::ensureKernelShutdown();
     }

src/Symfony/Bundle/FrameworkBundle/Test/WebTestCase.php

@@ -21,11 +21,12 @@ use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
  */
 abstract class WebTestCase extends KernelTestCase
 {
+    use ForwardCompatTestTrait;
     use WebTestAssertionsTrait;
 
-    protected function doTearDown(): void
+    private function doTearDown()
     {
-        parent::doTearDown();
+        parent::tearDown();
         self::getClient(null);
     }
 

src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/AnnotationsCacheWarmerTest.php

@@ -5,6 +5,7 @@ namespace Symfony\Bundle\FrameworkBundle\Tests\CacheWarmer;
 use Doctrine\Common\Annotations\AnnotationReader;
 use Doctrine\Common\Annotations\CachedReader;
 use Doctrine\Common\Annotations\Reader;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\CacheWarmer\AnnotationsCacheWarmer;
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\Cache\Adapter\NullAdapter;
@@ -14,9 +15,11 @@ use Symfony\Component\Filesystem\Filesystem;
 
 class AnnotationsCacheWarmerTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $cacheDir;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->cacheDir = sys_get_temp_dir().'/'.uniqid();
         $fs = new Filesystem();
@@ -24,7 +27,7 @@ class AnnotationsCacheWarmerTest extends TestCase
         parent::setUp();
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $fs = new Filesystem();
         $fs->remove($this->cacheDir);

src/Symfony/Bundle/FrameworkBundle/Tests/Command/CacheClearCommand/CacheClearCommandTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Command\CacheClearCommand;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Bundle\FrameworkBundle\Tests\Command\CacheClearCommand\Fixture\TestAppKernel;
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
@@ -23,19 +24,21 @@ use Symfony\Component\Finder\Finder;
 
 class CacheClearCommandTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /** @var TestAppKernel */
     private $kernel;
     /** @var Filesystem */
     private $fs;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->fs = new Filesystem();
         $this->kernel = new TestAppKernel('test', true);
         $this->fs->mkdir($this->kernel->getProjectDir());
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $this->fs->remove($this->kernel->getProjectDir());
     }

src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationDebugCommandTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Command\TranslationDebugCommand;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Tester\CommandTester;
@@ -20,6 +21,8 @@ use Symfony\Component\Filesystem\Filesystem;
 
 class TranslationDebugCommandTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $fs;
     private $translationDir;
 
@@ -111,7 +114,7 @@ class TranslationDebugCommandTest extends TestCase
         $tester->execute(['locale' => 'en', 'bundle' => 'dir']);
     }
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->fs = new Filesystem();
         $this->translationDir = sys_get_temp_dir().'/'.uniqid('sf_translation', true);
@@ -119,7 +122,7 @@ class TranslationDebugCommandTest extends TestCase
         $this->fs->mkdir($this->translationDir.'/templates');
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $this->fs->remove($this->translationDir);
     }

src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationUpdateCommandTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Command\TranslationUpdateCommand;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Tester\CommandTester;
@@ -21,6 +22,8 @@ use Symfony\Component\HttpKernel;
 
 class TranslationUpdateCommandTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $fs;
     private $translationDir;
 
@@ -88,7 +91,7 @@ class TranslationUpdateCommandTest extends TestCase
         $this->assertRegExp('/Translation files were successfully updated./', $tester->getDisplay());
     }
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->fs = new Filesystem();
         $this->translationDir = sys_get_temp_dir().'/'.uniqid('sf_translation', true);
@@ -96,7 +99,7 @@ class TranslationUpdateCommandTest extends TestCase
         $this->fs->mkdir($this->translationDir.'/templates');
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $this->fs->remove($this->translationDir);
     }

src/Symfony/Bundle/FrameworkBundle/Tests/Command/YamlLintCommandTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Command\YamlLintCommand;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Application as BaseApplication;
@@ -28,6 +29,8 @@ use Symfony\Component\HttpKernel\KernelInterface;
  */
 class YamlLintCommandTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $files;
 
     public function testLintCorrectFile()
@@ -183,13 +186,13 @@ EOF;
         return $application;
     }
 
-    protected function setUp()
+    private function doSetUp()
     {
         @mkdir(sys_get_temp_dir().'/yml-lint-test');
         $this->files = [];
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         foreach ($this->files as $file) {
             if (file_exists($file)) {

src/Symfony/Bundle/FrameworkBundle/Tests/Console/Descriptor/TextDescriptorTest.php

@@ -11,16 +11,19 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Console\Descriptor;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Console\Descriptor\TextDescriptor;
 
 class TextDescriptorTest extends AbstractDescriptorTest
 {
-    protected function setUp()
+    use ForwardCompatTestTrait;
+
+    private function doSetUp()
     {
         putenv('COLUMNS=121');
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         putenv('COLUMNS');
     }

src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/DataCollectorTranslatorPassTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\DataCollectorTranslatorPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
@@ -19,10 +20,12 @@ use Symfony\Contracts\Translation\TranslatorInterface;
 
 class DataCollectorTranslatorPassTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $container;
     private $dataCollectorTranslatorPass;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->container = new ContainerBuilder();
         $this->dataCollectorTranslatorPass = new DataCollectorTranslatorPass();

src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/WorkflowGuardListenerPassTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\WorkflowGuardListenerPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolverInterface;
@@ -22,10 +23,12 @@ use Symfony\Component\Validator\Validator\ValidatorInterface;
 
 class WorkflowGuardListenerPassTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $container;
     private $compilerPass;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->container = new ContainerBuilder();
         $this->compilerPass = new WorkflowGuardListenerPass();

src/Symfony/Bundle/FrameworkBundle/Tests/Functional/AbstractWebTestCase.php

@@ -11,23 +11,26 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Functional;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase as BaseWebTestCase;
 use Symfony\Component\Filesystem\Filesystem;
 
 abstract class AbstractWebTestCase extends BaseWebTestCase
 {
+    use ForwardCompatTestTrait;
+
     public static function assertRedirect($response, $location)
     {
         self::assertTrue($response->isRedirect(), 'Response is not a redirect, got status code: '.$response->getStatusCode());
         self::assertEquals('http://localhost'.$location, $response->headers->get('Location'));
     }
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         static::deleteTmpDir();
     }
 
-    public static function tearDownAfterClass()
+    private static function doTearDownAfterClass()
     {
         static::deleteTmpDir();
     }

src/Symfony/Bundle/FrameworkBundle/Tests/Functional/CachePoolClearCommandTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Functional;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Command\CachePoolClearCommand;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Tester\CommandTester;
@@ -20,7 +21,9 @@ use Symfony\Component\Console\Tester\CommandTester;
  */
 class CachePoolClearCommandTest extends AbstractWebTestCase
 {
-    protected function setUp()
+    use ForwardCompatTestTrait;
+
+    private function doSetUp()
     {
         static::bootKernel(['test_case' => 'CachePoolClear', 'root_config' => 'config.yml']);
     }

src/Symfony/Bundle/FrameworkBundle/Tests/Functional/ConfigDebugCommandTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Functional;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Input\ArrayInput;
 use Symfony\Component\Console\Output\NullOutput;
@@ -21,9 +22,11 @@ use Symfony\Component\Console\Tester\CommandTester;
  */
 class ConfigDebugCommandTest extends AbstractWebTestCase
 {
+    use ForwardCompatTestTrait;
+
     private $application;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $kernel = static::createKernel(['test_case' => 'ConfigDump', 'root_config' => 'config.yml']);
         $this->application = new Application($kernel);

src/Symfony/Bundle/FrameworkBundle/Tests/Functional/ConfigDumpReferenceCommandTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Functional;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Input\ArrayInput;
 use Symfony\Component\Console\Output\NullOutput;
@@ -21,9 +22,11 @@ use Symfony\Component\Console\Tester\CommandTester;
  */
 class ConfigDumpReferenceCommandTest extends AbstractWebTestCase
 {
+    use ForwardCompatTestTrait;
+
     private $application;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $kernel = static::createKernel(['test_case' => 'ConfigDump', 'root_config' => 'config.yml']);
         $this->application = new Application($kernel);

src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php

@@ -13,6 +13,7 @@ namespace Symfony\Bundle\FrameworkBundle\Tests\Translation;
 
 use PHPUnit\Framework\TestCase;
 use Psr\Container\ContainerInterface;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Translation\Translator;
 use Symfony\Component\Config\Resource\DirectoryResource;
 use Symfony\Component\Config\Resource\FileExistenceResource;
@@ -22,15 +23,17 @@ use Symfony\Component\Translation\MessageCatalogue;
 
 class TranslatorTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $tmpDir;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->tmpDir = sys_get_temp_dir().'/sf_translation';
         $this->deleteTmpDir();
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $this->deleteTmpDir();
     }

src/Symfony/Bundle/SecurityBundle/Tests/Functional/AbstractWebTestCase.php

@@ -11,23 +11,26 @@
 
 namespace Symfony\Bundle\SecurityBundle\Tests\Functional;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase as BaseWebTestCase;
 use Symfony\Component\Filesystem\Filesystem;
 
 abstract class AbstractWebTestCase extends BaseWebTestCase
 {
+    use ForwardCompatTestTrait;
+
     public static function assertRedirect($response, $location)
     {
         self::assertTrue($response->isRedirect(), 'Response is not a redirect, got status code: '.substr($response, 0, 2000));
         self::assertEquals('http://localhost'.$location, $response->headers->get('Location'));
     }
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         static::deleteTmpDir();
     }
 
-    public static function tearDownAfterClass()
+    private static function doTearDownAfterClass()
     {
         static::deleteTmpDir();
     }

src/Symfony/Bundle/SecurityBundle/Tests/Functional/UserPasswordEncoderCommandTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\SecurityBundle\Tests\Functional;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Bundle\SecurityBundle\Command\UserPasswordEncoderCommand;
 use Symfony\Component\Console\Application as ConsoleApplication;
@@ -27,6 +28,8 @@ use Symfony\Component\Security\Core\Encoder\SodiumPasswordEncoder;
  */
 class UserPasswordEncoderCommandTest extends AbstractWebTestCase
 {
+    use ForwardCompatTestTrait;
+
     /** @var CommandTester */
     private $passwordEncoderCommandTester;
 
@@ -226,7 +229,7 @@ EOTXT
         ], ['interactive' => false]);
     }
 
-    protected function setUp()
+    private function doSetUp()
     {
         putenv('COLUMNS='.(119 + \strlen(PHP_EOL)));
         $kernel = $this->createKernel(['test_case' => 'PasswordEncode']);
@@ -239,7 +242,7 @@ EOTXT
         $this->passwordEncoderCommandTester = new CommandTester($passwordEncoderCommand);
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $this->passwordEncoderCommandTester = null;
     }

src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/Compiler/TwigLoaderPassTest.php

@@ -12,12 +12,15 @@
 namespace Symfony\Bundle\TwigBundle\Tests\DependencyInjection\Compiler;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\TwigLoaderPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 
 class TwigLoaderPassTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /**
      * @var ContainerBuilder
      */
@@ -31,7 +34,7 @@ class TwigLoaderPassTest extends TestCase
      */
     private $pass;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->builder = new ContainerBuilder();
         $this->builder->register('twig');

src/Symfony/Bundle/TwigBundle/Tests/Functional/NoTemplatingEntryTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\TwigBundle\Tests\Functional;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
 use Symfony\Bundle\TwigBundle\Tests\TestCase;
 use Symfony\Bundle\TwigBundle\TwigBundle;
@@ -20,6 +21,8 @@ use Symfony\Component\HttpKernel\Kernel;
 
 class NoTemplatingEntryTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     public function test()
     {
         $kernel = new NoTemplatingEntryKernel('dev', true);
@@ -30,12 +33,12 @@ class NoTemplatingEntryTest extends TestCase
         $this->assertContains('{ a: b }', $content);
     }
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->deleteTempDir();
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $this->deleteTempDir();
     }

src/Symfony/Bundle/WebProfilerBundle/Tests/DependencyInjection/WebProfilerExtensionTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\WebProfilerBundle\Tests\DependencyInjection;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\WebProfilerBundle\DependencyInjection\WebProfilerExtension;
 use Symfony\Bundle\WebProfilerBundle\Tests\TestCase;
 use Symfony\Component\DependencyInjection\Container;
@@ -23,6 +24,8 @@ use Symfony\Component\EventDispatcher\EventDispatcher;
 
 class WebProfilerExtensionTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $kernel;
     /**
      * @var \Symfony\Component\DependencyInjection\Container
@@ -47,7 +50,7 @@ class WebProfilerExtensionTest extends TestCase
         self::assertEquals([], $errors, $message);
     }
 
-    protected function setUp()
+    private function doSetUp()
     {
         parent::setUp();
 
@@ -75,7 +78,7 @@ class WebProfilerExtensionTest extends TestCase
         $this->container->addCompilerPass(new RegisterListenersPass());
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         parent::tearDown();
 

src/Symfony/Bundle/WebProfilerBundle/Tests/Profiler/TemplateManagerTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\WebProfilerBundle\Tests\Profiler;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\WebProfilerBundle\Profiler\TemplateManager;
 use Symfony\Bundle\WebProfilerBundle\Tests\TestCase;
 use Symfony\Component\HttpKernel\Profiler\Profile;
@@ -23,6 +24,8 @@ use Twig\Environment;
  */
 class TemplateManagerTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /**
      * @var Environment
      */
@@ -38,7 +41,7 @@ class TemplateManagerTest extends TestCase
      */
     protected $templateManager;
 
-    protected function setUp()
+    private function doSetUp()
     {
         parent::setUp();
 

src/Symfony/Component/Cache/Tests/Adapter/AbstractRedisAdapterTest.php

@@ -11,10 +11,13 @@
 
 namespace Symfony\Component\Cache\Tests\Adapter;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\RedisAdapter;
 
 abstract class AbstractRedisAdapterTest extends AdapterTestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $skippedTests = [
         'testExpiration' => 'Testing expiration slows down the test suite',
         'testHasItemReturnsFalseWhenDeferredItemIsExpired' => 'Testing expiration slows down the test suite',
@@ -28,7 +31,7 @@ abstract class AbstractRedisAdapterTest extends AdapterTestCase
         return new RedisAdapter(self::$redis, str_replace('\\', '.', __CLASS__), $defaultLifetime);
     }
 
-    public static function setupBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         if (!\extension_loaded('redis')) {
             self::markTestSkipped('Extension redis required.');
@@ -39,7 +42,7 @@ abstract class AbstractRedisAdapterTest extends AdapterTestCase
         }
     }
 
-    public static function tearDownAfterClass()
+    private static function doTearDownAfterClass()
     {
         self::$redis = null;
     }

src/Symfony/Component/Cache/Tests/Adapter/AdapterTestCase.php

@@ -15,13 +15,16 @@ use Cache\IntegrationTests\CachePoolTest;
 use PHPUnit\Framework\Assert;
 use Psr\Cache\CacheItemInterface;
 use Psr\Cache\CacheItemPoolInterface;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\CacheItem;
 use Symfony\Component\Cache\PruneableInterface;
 use Symfony\Contracts\Cache\CallbackInterface;
 
 abstract class AdapterTestCase extends CachePoolTest
 {
-    protected function setUp()
+    use ForwardCompatTestTrait;
+
+    private function doSetUp()
     {
         parent::setUp();
 

src/Symfony/Component/Cache/Tests/Adapter/FilesystemAdapterTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Cache\Tests\Adapter;
 
 use Psr\Cache\CacheItemPoolInterface;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 
 /**
@@ -19,12 +20,14 @@ use Symfony\Component\Cache\Adapter\FilesystemAdapter;
  */
 class FilesystemAdapterTest extends AdapterTestCase
 {
+    use ForwardCompatTestTrait;
+
     public function createCachePool($defaultLifetime = 0)
     {
         return new FilesystemAdapter('', $defaultLifetime);
     }
 
-    public static function tearDownAfterClass()
+    private static function doTearDownAfterClass()
     {
         self::rmdir(sys_get_temp_dir().'/symfony-cache');
     }

src/Symfony/Component/Cache/Tests/Adapter/MemcachedAdapterTest.php

@@ -11,11 +11,14 @@
 
 namespace Symfony\Component\Cache\Tests\Adapter;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\AbstractAdapter;
 use Symfony\Component\Cache\Adapter\MemcachedAdapter;
 
 class MemcachedAdapterTest extends AdapterTestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $skippedTests = [
         'testHasItemReturnsFalseWhenDeferredItemIsExpired' => 'Testing expiration slows down the test suite',
         'testDefaultLifeTime' => 'Testing expiration slows down the test suite',
@@ -24,7 +27,7 @@ class MemcachedAdapterTest extends AdapterTestCase
 
     protected static $client;
 
-    public static function setupBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         if (!MemcachedAdapter::isSupported()) {
             self::markTestSkipped('Extension memcached >=2.2.0 required.');

src/Symfony/Component/Cache/Tests/Adapter/PdoAdapterTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Cache\Tests\Adapter;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\PdoAdapter;
 use Symfony\Component\Cache\Tests\Traits\PdoPruneableTrait;
 
@@ -19,11 +20,12 @@ use Symfony\Component\Cache\Tests\Traits\PdoPruneableTrait;
  */
 class PdoAdapterTest extends AdapterTestCase
 {
+    use ForwardCompatTestTrait;
     use PdoPruneableTrait;
 
     protected static $dbFile;
 
-    public static function setupBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         if (!\extension_loaded('pdo_sqlite')) {
             self::markTestSkipped('Extension pdo_sqlite required.');
@@ -35,7 +37,7 @@ class PdoAdapterTest extends AdapterTestCase
         $pool->createTable();
     }
 
-    public static function tearDownAfterClass()
+    private static function doTearDownAfterClass()
     {
         @unlink(self::$dbFile);
     }

src/Symfony/Component/Cache/Tests/Adapter/PdoDbalAdapterTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Cache\Tests\Adapter;
 
 use Doctrine\DBAL\DriverManager;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\PdoAdapter;
 use Symfony\Component\Cache\Tests\Traits\PdoPruneableTrait;
 
@@ -20,11 +21,12 @@ use Symfony\Component\Cache\Tests\Traits\PdoPruneableTrait;
  */
 class PdoDbalAdapterTest extends AdapterTestCase
 {
+    use ForwardCompatTestTrait;
     use PdoPruneableTrait;
 
     protected static $dbFile;
 
-    public static function setupBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         if (!\extension_loaded('pdo_sqlite')) {
             self::markTestSkipped('Extension pdo_sqlite required.');
@@ -35,7 +37,7 @@ class PdoDbalAdapterTest extends AdapterTestCase
         $pool = new PdoAdapter(DriverManager::getConnection(['driver' => 'pdo_sqlite', 'path' => self::$dbFile]));
     }
 
-    public static function tearDownAfterClass()
+    private static function doTearDownAfterClass()
     {
         @unlink(self::$dbFile);
     }

src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Cache\Tests\Adapter;
 
 use Psr\Cache\CacheItemInterface;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 use Symfony\Component\Cache\Adapter\NullAdapter;
 use Symfony\Component\Cache\Adapter\PhpArrayAdapter;
@@ -21,6 +22,8 @@ use Symfony\Component\Cache\Adapter\PhpArrayAdapter;
  */
 class PhpArrayAdapterTest extends AdapterTestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $skippedTests = [
         'testGet' => 'PhpArrayAdapter is read-only.',
         'testRecursiveGet' => 'PhpArrayAdapter is read-only.',
@@ -58,12 +61,12 @@ class PhpArrayAdapterTest extends AdapterTestCase
 
     protected static $file;
 
-    public static function setupBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$file = sys_get_temp_dir().'/symfony-cache/php-array-adapter-test.php';
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         if (file_exists(sys_get_temp_dir().'/symfony-cache')) {
             FilesystemAdapterTest::rmdir(sys_get_temp_dir().'/symfony-cache');

src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterWithFallbackTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Cache\Tests\Adapter;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 use Symfony\Component\Cache\Adapter\PhpArrayAdapter;
 
@@ -19,6 +20,8 @@ use Symfony\Component\Cache\Adapter\PhpArrayAdapter;
  */
 class PhpArrayAdapterWithFallbackTest extends AdapterTestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $skippedTests = [
         'testGetItemInvalidKeys' => 'PhpArrayAdapter does not throw exceptions on invalid key.',
         'testGetItemsInvalidKeys' => 'PhpArrayAdapter does not throw exceptions on invalid key.',
@@ -30,12 +33,12 @@ class PhpArrayAdapterWithFallbackTest extends AdapterTestCase
 
     protected static $file;
 
-    public static function setupBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$file = sys_get_temp_dir().'/symfony-cache/php-array-adapter-test.php';
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         if (file_exists(sys_get_temp_dir().'/symfony-cache')) {
             FilesystemAdapterTest::rmdir(sys_get_temp_dir().'/symfony-cache');

src/Symfony/Component/Cache/Tests/Adapter/PhpFilesAdapterTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Cache\Tests\Adapter;
 
 use Psr\Cache\CacheItemPoolInterface;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\PhpFilesAdapter;
 
 /**
@@ -19,6 +20,8 @@ use Symfony\Component\Cache\Adapter\PhpFilesAdapter;
  */
 class PhpFilesAdapterTest extends AdapterTestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $skippedTests = [
         'testDefaultLifeTime' => 'PhpFilesAdapter does not allow configuring a default lifetime.',
     ];
@@ -28,7 +31,7 @@ class PhpFilesAdapterTest extends AdapterTestCase
         return new PhpFilesAdapter('sf-cache');
     }
 
-    public static function tearDownAfterClass()
+    private static function doTearDownAfterClass()
     {
         FilesystemAdapterTest::rmdir(sys_get_temp_dir().'/symfony-cache');
     }

src/Symfony/Component/Cache/Tests/Adapter/PredisAdapterTest.php

@@ -12,11 +12,14 @@
 namespace Symfony\Component\Cache\Tests\Adapter;
 
 use Predis\Connection\StreamConnection;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\RedisAdapter;
 
 class PredisAdapterTest extends AbstractRedisAdapterTest
 {
-    public static function setupBeforeClass()
+    use ForwardCompatTestTrait;
+
+    private static function doSetUpBeforeClass()
     {
         parent::setupBeforeClass();
         self::$redis = new \Predis\Client(['host' => getenv('REDIS_HOST')]);

src/Symfony/Component/Cache/Tests/Adapter/PredisClusterAdapterTest.php

@@ -11,15 +11,19 @@
 
 namespace Symfony\Component\Cache\Tests\Adapter;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
+
 class PredisClusterAdapterTest extends AbstractRedisAdapterTest
 {
-    public static function setupBeforeClass()
+    use ForwardCompatTestTrait;
+
+    private static function doSetUpBeforeClass()
     {
         parent::setupBeforeClass();
         self::$redis = new \Predis\Client([['host' => getenv('REDIS_HOST')]]);
     }
 
-    public static function tearDownAfterClass()
+    private static function doTearDownAfterClass()
     {
         self::$redis = null;
     }

src/Symfony/Component/Cache/Tests/Adapter/PredisRedisClusterAdapterTest.php

@@ -11,11 +11,14 @@
 
 namespace Symfony\Component\Cache\Tests\Adapter;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\RedisAdapter;
 
 class PredisRedisClusterAdapterTest extends AbstractRedisAdapterTest
 {
-    public static function setupBeforeClass()
+    use ForwardCompatTestTrait;
+
+    private static function doSetUpBeforeClass()
     {
         if (!$hosts = getenv('REDIS_CLUSTER_HOSTS')) {
             self::markTestSkipped('REDIS_CLUSTER_HOSTS env var is not defined.');
@@ -24,7 +27,7 @@ class PredisRedisClusterAdapterTest extends AbstractRedisAdapterTest
         self::$redis = RedisAdapter::createConnection('redis:?host['.str_replace(' ', ']&host[', $hosts).']', ['class' => \Predis\Client::class, 'redis_cluster' => true]);
     }
 
-    public static function tearDownAfterClass()
+    private static function doTearDownAfterClass()
     {
         self::$redis = null;
     }

src/Symfony/Component/Cache/Tests/Adapter/RedisAdapterTest.php

@@ -11,13 +11,16 @@
 
 namespace Symfony\Component\Cache\Tests\Adapter;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\AbstractAdapter;
 use Symfony\Component\Cache\Adapter\RedisAdapter;
 use Symfony\Component\Cache\Traits\RedisProxy;
 
 class RedisAdapterTest extends AbstractRedisAdapterTest
 {
-    public static function setupBeforeClass()
+    use ForwardCompatTestTrait;
+
+    private static function doSetUpBeforeClass()
     {
         parent::setupBeforeClass();
         self::$redis = AbstractAdapter::createConnection('redis://'.getenv('REDIS_HOST'), ['lazy' => true]);

src/Symfony/Component/Cache/Tests/Adapter/RedisArrayAdapterTest.php

@@ -11,9 +11,13 @@
 
 namespace Symfony\Component\Cache\Tests\Adapter;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
+
 class RedisArrayAdapterTest extends AbstractRedisAdapterTest
 {
-    public static function setupBeforeClass()
+    use ForwardCompatTestTrait;
+
+    private static function doSetUpBeforeClass()
     {
         parent::setupBeforeClass();
         if (!class_exists('RedisArray')) {

src/Symfony/Component/Cache/Tests/Adapter/RedisClusterAdapterTest.php

@@ -11,13 +11,16 @@
 
 namespace Symfony\Component\Cache\Tests\Adapter;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\AbstractAdapter;
 use Symfony\Component\Cache\Adapter\RedisAdapter;
 use Symfony\Component\Cache\Traits\RedisClusterProxy;
 
 class RedisClusterAdapterTest extends AbstractRedisAdapterTest
 {
-    public static function setupBeforeClass()
+    use ForwardCompatTestTrait;
+
+    private static function doSetUpBeforeClass()
     {
         if (!class_exists('RedisCluster')) {
             self::markTestSkipped('The RedisCluster class is required.');

src/Symfony/Component/Cache/Tests/Adapter/TagAwareAdapterTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Cache\Tests\Adapter;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Cache\Adapter\AdapterInterface;
 use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 use Symfony\Component\Cache\Adapter\TagAwareAdapter;
@@ -21,6 +22,7 @@ use Symfony\Component\Cache\Tests\Traits\TagAwareTestTrait;
  */
 class TagAwareAdapterTest extends AdapterTestCase
 {
+    use ForwardCompatTestTrait;
     use TagAwareTestTrait;
 
     public function createCachePool($defaultLifetime = 0)
@@ -28,7 +30,7 @@ class TagAwareAdapterTest extends AdapterTestCase
         return new TagAwareAdapter(new FilesystemAdapter('', $defaultLifetime));
     }
 
-    public static function tearDownAfterClass()
+    private static function doTearDownAfterClass()
     {
         FilesystemAdapterTest::rmdir(sys_get_temp_dir().'/symfony-cache');
     }

src/Symfony/Component/ClassLoader/Tests/ApcClassLoaderTest.php

@@ -0,0 +1,203 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ClassLoader\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
+use Symfony\Component\ClassLoader\ApcClassLoader;
+use Symfony\Component\ClassLoader\ClassLoader;
+
+/**
+ * @group legacy
+ */
+class ApcClassLoaderTest extends TestCase
+{
+    use ForwardCompatTestTrait;
+
+    private function doSetUp()
+    {
+        if (!(filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) && filter_var(ini_get('apc.enable_cli'), FILTER_VALIDATE_BOOLEAN))) {
+            $this->markTestSkipped('The apc extension is not enabled.');
+        } else {
+            apcu_clear_cache();
+        }
+    }
+
+    private function doTearDown()
+    {
+        if (filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) && filter_var(ini_get('apc.enable_cli'), FILTER_VALIDATE_BOOLEAN)) {
+            apcu_clear_cache();
+        }
+    }
+
+    public function testConstructor()
+    {
+        $loader = new ClassLoader();
+        $loader->addPrefix('Apc\Namespaced', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+
+        $loader = new ApcClassLoader('test.prefix.', $loader);
+
+        $this->assertEquals($loader->findFile('\Apc\Namespaced\FooBar'), apcu_fetch('test.prefix.\Apc\Namespaced\FooBar'), '__construct() takes a prefix as its first argument');
+    }
+
+    /**
+     * @dataProvider getLoadClassTests
+     */
+    public function testLoadClass($className, $testClassName, $message)
+    {
+        $loader = new ClassLoader();
+        $loader->addPrefix('Apc\Namespaced', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Apc_Pearlike_', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+
+        $loader = new ApcClassLoader('test.prefix.', $loader);
+        $loader->loadClass($testClassName);
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassTests()
+    {
+        return [
+           ['\\Apc\\Namespaced\\Foo', 'Apc\\Namespaced\\Foo',   '->loadClass() loads Apc\Namespaced\Foo class'],
+           ['Apc_Pearlike_Foo',    'Apc_Pearlike_Foo',      '->loadClass() loads Apc_Pearlike_Foo class'],
+        ];
+    }
+
+    /**
+     * @dataProvider getLoadClassFromFallbackTests
+     */
+    public function testLoadClassFromFallback($className, $testClassName, $message)
+    {
+        $loader = new ClassLoader();
+        $loader->addPrefix('Apc\Namespaced', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Apc_Pearlike_', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('', [__DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/fallback']);
+
+        $loader = new ApcClassLoader('test.prefix.fallback', $loader);
+        $loader->loadClass($testClassName);
+
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassFromFallbackTests()
+    {
+        return [
+           ['\\Apc\\Namespaced\\Baz',    'Apc\\Namespaced\\Baz',    '->loadClass() loads Apc\Namespaced\Baz class'],
+           ['Apc_Pearlike_Baz',       'Apc_Pearlike_Baz',       '->loadClass() loads Apc_Pearlike_Baz class'],
+           ['\\Apc\\Namespaced\\FooBar', 'Apc\\Namespaced\\FooBar', '->loadClass() loads Apc\Namespaced\Baz class from fallback dir'],
+           ['Apc_Pearlike_FooBar',    'Apc_Pearlike_FooBar',    '->loadClass() loads Apc_Pearlike_Baz class from fallback dir'],
+       ];
+    }
+
+    /**
+     * @dataProvider getLoadClassNamespaceCollisionTests
+     */
+    public function testLoadClassNamespaceCollision($namespaces, $className, $message)
+    {
+        $loader = new ClassLoader();
+        $loader->addPrefixes($namespaces);
+
+        $loader = new ApcClassLoader('test.prefix.collision.', $loader);
+        $loader->loadClass($className);
+
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassNamespaceCollisionTests()
+    {
+        return [
+           [
+               [
+                   'Apc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+               ],
+               'Apc\NamespaceCollision\A\Foo',
+               '->loadClass() loads NamespaceCollision\A\Foo from alpha.',
+           ],
+           [
+               [
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+                   'Apc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+               ],
+               'Apc\NamespaceCollision\A\Bar',
+               '->loadClass() loads NamespaceCollision\A\Bar from alpha.',
+           ],
+           [
+               [
+                   'Apc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+               ],
+               'Apc\NamespaceCollision\A\B\Foo',
+               '->loadClass() loads NamespaceCollision\A\B\Foo from beta.',
+           ],
+           [
+               [
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+                   'Apc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+               ],
+               'Apc\NamespaceCollision\A\B\Bar',
+               '->loadClass() loads NamespaceCollision\A\B\Bar from beta.',
+           ],
+        ];
+    }
+
+    /**
+     * @dataProvider getLoadClassPrefixCollisionTests
+     */
+    public function testLoadClassPrefixCollision($prefixes, $className, $message)
+    {
+        $loader = new ClassLoader();
+        $loader->addPrefixes($prefixes);
+
+        $loader = new ApcClassLoader('test.prefix.collision.', $loader);
+        $loader->loadClass($className);
+
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassPrefixCollisionTests()
+    {
+        return [
+           [
+               [
+                   'ApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
+                   'ApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
+               ],
+               'ApcPrefixCollision_A_Foo',
+               '->loadClass() loads ApcPrefixCollision_A_Foo from alpha.',
+           ],
+           [
+               [
+                   'ApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
+                   'ApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
+               ],
+               'ApcPrefixCollision_A_Bar',
+               '->loadClass() loads ApcPrefixCollision_A_Bar from alpha.',
+           ],
+           [
+               [
+                   'ApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
+                   'ApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
+               ],
+               'ApcPrefixCollision_A_B_Foo',
+               '->loadClass() loads ApcPrefixCollision_A_B_Foo from beta.',
+           ],
+           [
+               [
+                   'ApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
+                   'ApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
+               ],
+               'ApcPrefixCollision_A_B_Bar',
+               '->loadClass() loads ApcPrefixCollision_A_B_Bar from beta.',
+           ],
+        ];
+    }
+}

src/Symfony/Component/Config/Tests/ConfigCacheTest.php

@@ -12,19 +12,22 @@
 namespace Symfony\Component\Config\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\ConfigCache;
 use Symfony\Component\Config\Tests\Resource\ResourceStub;
 
 class ConfigCacheTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $cacheFile = null;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->cacheFile = tempnam(sys_get_temp_dir(), 'config_');
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $files = [$this->cacheFile, $this->cacheFile.'.meta'];
 

src/Symfony/Component/Config/Tests/Resource/DirectoryResourceTest.php

@@ -12,13 +12,16 @@
 namespace Symfony\Component\Config\Tests\Resource;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\Resource\DirectoryResource;
 
 class DirectoryResourceTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $directory;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->directory = sys_get_temp_dir().\DIRECTORY_SEPARATOR.'symfonyDirectoryIterator';
         if (!file_exists($this->directory)) {
@@ -27,7 +30,7 @@ class DirectoryResourceTest extends TestCase
         touch($this->directory.'/tmp.xml');
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         if (!is_dir($this->directory)) {
             return;

src/Symfony/Component/Config/Tests/Resource/FileExistenceResourceTest.php

@@ -12,22 +12,25 @@
 namespace Symfony\Component\Config\Tests\Resource;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\Resource\FileExistenceResource;
 
 class FileExistenceResourceTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $resource;
     protected $file;
     protected $time;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->file = realpath(sys_get_temp_dir()).'/tmp.xml';
         $this->time = time();
         $this->resource = new FileExistenceResource($this->file);
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         if (file_exists($this->file)) {
             unlink($this->file);

src/Symfony/Component/Config/Tests/Resource/FileResourceTest.php

@@ -12,15 +12,18 @@
 namespace Symfony\Component\Config\Tests\Resource;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\Resource\FileResource;
 
 class FileResourceTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $resource;
     protected $file;
     protected $time;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->file = sys_get_temp_dir().'/tmp.xml';
         $this->time = time();
@@ -28,7 +31,7 @@ class FileResourceTest extends TestCase
         $this->resource = new FileResource($this->file);
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         if (!file_exists($this->file)) {
             return;

src/Symfony/Component/Config/Tests/Resource/GlobResourceTest.php

@@ -12,11 +12,14 @@
 namespace Symfony\Component\Config\Tests\Resource;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\Resource\GlobResource;
 
 class GlobResourceTest extends TestCase
 {
-    protected function tearDown()
+    use ForwardCompatTestTrait;
+
+    private function doTearDown()
     {
         $dir = \dirname(__DIR__).'/Fixtures';
         @rmdir($dir.'/TmpGlob');

src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php

@@ -12,20 +12,23 @@
 namespace Symfony\Component\Config\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Config\ResourceCheckerConfigCache;
 use Symfony\Component\Config\Tests\Resource\ResourceStub;
 
 class ResourceCheckerConfigCacheTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $cacheFile = null;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->cacheFile = tempnam(sys_get_temp_dir(), 'config_');
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $files = [$this->cacheFile, "{$this->cacheFile}.meta"];
 

src/Symfony/Component/Console/Tests/ApplicationTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Console\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\CommandLoader\FactoryCommandLoader;
@@ -39,16 +40,18 @@ use Symfony\Component\EventDispatcher\EventDispatcher;
 
 class ApplicationTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected static $fixturesPath;
 
     private $colSize;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->colSize = getenv('COLUMNS');
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         putenv($this->colSize ? 'COLUMNS='.$this->colSize : 'COLUMNS');
         putenv('SHELL_VERBOSITY');
@@ -56,7 +59,7 @@ class ApplicationTest extends TestCase
         unset($_SERVER['SHELL_VERBOSITY']);
     }
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixturesPath = realpath(__DIR__.'/Fixtures/');
         require_once self::$fixturesPath.'/FooCommand.php';

src/Symfony/Component/Console/Tests/Command/CommandTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Console\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Helper\FormatterHelper;
@@ -26,9 +27,11 @@ use Symfony\Component\Console\Tester\CommandTester;
 
 class CommandTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected static $fixturesPath;
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixturesPath = __DIR__.'/../Fixtures/';
         require_once self::$fixturesPath.'/TestCommand.php';

src/Symfony/Component/Console/Tests/Command/LockableTraitTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Console\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Console\Tester\CommandTester;
 use Symfony\Component\Lock\LockFactory;
 use Symfony\Component\Lock\Store\FlockStore;
@@ -19,9 +20,11 @@ use Symfony\Component\Lock\Store\SemaphoreStore;
 
 class LockableTraitTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected static $fixturesPath;
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixturesPath = __DIR__.'/../Fixtures/';
         require_once self::$fixturesPath.'/FooLockCommand.php';

src/Symfony/Component/Console/Tests/Helper/ProgressBarTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Console\Tests\Helper;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Console\Formatter\OutputFormatter;
 use Symfony\Component\Console\Helper\Helper;
 use Symfony\Component\Console\Helper\ProgressBar;
@@ -23,15 +24,17 @@ use Symfony\Component\Console\Output\StreamOutput;
  */
 class ProgressBarTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $colSize;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->colSize = getenv('COLUMNS');
         putenv('COLUMNS=120');
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         putenv($this->colSize ? 'COLUMNS='.$this->colSize : 'COLUMNS');
     }

src/Symfony/Component/Console/Tests/Helper/TableTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Console\Tests\Helper;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Console\Formatter\OutputFormatter;
 use Symfony\Component\Console\Helper\Table;
 use Symfony\Component\Console\Helper\TableCell;
@@ -22,14 +23,16 @@ use Symfony\Component\Console\Output\StreamOutput;
 
 class TableTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $stream;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->stream = fopen('php://memory', 'r+');
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         fclose($this->stream);
         $this->stream = null;

src/Symfony/Component/Console/Tests/Input/InputDefinitionTest.php

@@ -12,12 +12,15 @@
 namespace Symfony\Component\Console\Tests\Input;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputOption;
 
 class InputDefinitionTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected static $fixtures;
 
     protected $foo;
@@ -25,7 +28,7 @@ class InputDefinitionTest extends TestCase
     protected $foo1;
     protected $foo2;
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixtures = __DIR__.'/../Fixtures/';
     }

src/Symfony/Component/Console/Tests/Output/StreamOutputTest.php

@@ -12,19 +12,22 @@
 namespace Symfony\Component\Console\Tests\Output;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Console\Output\Output;
 use Symfony\Component\Console\Output\StreamOutput;
 
 class StreamOutputTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $stream;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->stream = fopen('php://memory', 'a', false);
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $this->stream = null;
     }

src/Symfony/Component/Console/Tests/Style/SymfonyStyleTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Console\Tests\Style;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Formatter\OutputFormatter;
 use Symfony\Component\Console\Input\InputInterface;
@@ -22,13 +23,15 @@ use Symfony\Component\Console\Tester\CommandTester;
 
 class SymfonyStyleTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /** @var Command */
     protected $command;
     /** @var CommandTester */
     protected $tester;
     private $colSize;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->colSize = getenv('COLUMNS');
         putenv('COLUMNS=121');
@@ -36,7 +39,7 @@ class SymfonyStyleTest extends TestCase
         $this->tester = new CommandTester($this->command);
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         putenv($this->colSize ? 'COLUMNS='.$this->colSize : 'COLUMNS');
         $this->command = null;

src/Symfony/Component/Console/Tests/TerminalTest.php

@@ -12,20 +12,23 @@
 namespace Symfony\Component\Console\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Console\Terminal;
 
 class TerminalTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $colSize;
     private $lineSize;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->colSize = getenv('COLUMNS');
         $this->lineSize = getenv('LINES');
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         putenv($this->colSize ? 'COLUMNS='.$this->colSize : 'COLUMNS');
         putenv($this->lineSize ? 'LINES' : 'LINES='.$this->lineSize);

src/Symfony/Component/Console/Tests/Tester/ApplicationTesterTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Console\Tests\Tester;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Helper\QuestionHelper;
 use Symfony\Component\Console\Output\Output;
@@ -20,10 +21,12 @@ use Symfony\Component\Console\Tester\ApplicationTester;
 
 class ApplicationTesterTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $application;
     protected $tester;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->application = new Application();
         $this->application->setAutoExit(false);
@@ -38,7 +41,7 @@ class ApplicationTesterTest extends TestCase
         $this->tester->run(['command' => 'foo', 'foo' => 'bar'], ['interactive' => false, 'decorated' => false, 'verbosity' => Output::VERBOSITY_VERBOSE]);
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $this->application = null;
         $this->tester = null;

src/Symfony/Component/Console/Tests/Tester/CommandTesterTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Console\Tests\Tester;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Helper\HelperSet;
@@ -24,10 +25,12 @@ use Symfony\Component\Console\Tester\CommandTester;
 
 class CommandTesterTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $command;
     protected $tester;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->command = new Command('foo');
         $this->command->addArgument('command');
@@ -38,7 +41,7 @@ class CommandTesterTest extends TestCase
         $this->tester->execute(['foo' => 'bar'], ['interactive' => false, 'decorated' => false, 'verbosity' => Output::VERBOSITY_VERBOSE]);
     }
 
-    protected function tearDown()
+    private function doTearDown()
     {
         $this->command = null;
         $this->tester = null;

src/Symfony/Component/DependencyInjection/CHANGELOG.md

@@ -16,6 +16,7 @@ CHANGELOG
 4.4.0
 -----
 
+ * added support for dumping the container in one file instead of many files
  * deprecated support for short factories and short configurators in Yaml
  * deprecated `tagged` in favor of `tagged_iterator`
  * deprecated passing an instance of `Symfony\Component\DependencyInjection\Parameter` as class name to `Symfony\Component\DependencyInjection\Definition`

src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php

@@ -73,6 +73,7 @@ class PhpDumper extends Dumper
     private $namespace;
     private $asFiles;
     private $hotPathTag;
+    private $inlineFactories;
     private $inlineRequires;
     private $inlinedRequires = [];
     private $circularReferences = [];
@@ -135,6 +136,7 @@ class PhpDumper extends Dumper
             'as_files' => false,
             'debug' => true,
             'hot_path_tag' => 'container.hot_path',
+            'inline_factories_parameter' => 'container.dumper.inline_factories',
             'inline_class_loader_parameter' => 'container.dumper.inline_class_loader',
             'service_locator_tag' => 'container.service_locator',
             'build_time' => time(),
@@ -144,6 +146,7 @@ class PhpDumper extends Dumper
         $this->namespace = $options['namespace'];
         $this->asFiles = $options['as_files'];
         $this->hotPathTag = $options['hot_path_tag'];
+        $this->inlineFactories = $this->asFiles && $options['inline_factories_parameter'] && $this->container->hasParameter($options['inline_factories_parameter']) && $this->container->getParameter($options['inline_factories_parameter']);
         $this->inlineRequires = $options['inline_class_loader_parameter'] && $this->container->hasParameter($options['inline_class_loader_parameter']) && $this->container->getParameter($options['inline_class_loader_parameter']);
         $this->serviceLocatorTag = $options['service_locator_tag'];
 
@@ -217,6 +220,8 @@ class PhpDumper extends Dumper
             }
         }
 
+        $proxyClasses = $this->inlineFactories ? $this->generateProxyClasses() : null;
+
         $code =
             $this->startClass($options['class'], $baseClass, $baseClassWithNamespace).
             $this->addServices($services).
@@ -224,6 +229,8 @@ class PhpDumper extends Dumper
             $this->addDefaultParametersMethod()
         ;
 
+        $proxyClasses = $proxyClasses ?? $this->generateProxyClasses();
+
         if ($this->addGetService) {
             $code = preg_replace(
                 "/(\r?\n\r?\n    public function __construct.+?\\{\r?\n)/s",
@@ -260,13 +267,24 @@ EOF;
                 $files['removed-ids.php'] = $c .= "];\n";
             }
 
-            foreach ($this->generateServiceFiles($services) as $file => $c) {
-                $files[$file] = $fileStart.$c;
+            if (!$this->inlineFactories) {
+                foreach ($this->generateServiceFiles($services) as $file => $c) {
+                    $files[$file] = $fileStart.$c;
+                }
+                foreach ($proxyClasses as $file => $c) {
+                    $files[$file] = "<?php\n".$c;
+                }
             }
-            foreach ($this->generateProxyClasses() as $file => $c) {
-                $files[$file] = "<?php\n".$c;
+
+            $code .= $this->endClass();
+
+            if ($this->inlineFactories) {
+                foreach ($proxyClasses as $c) {
+                    $code .= $c;
+                }
             }
-            $files[$options['class'].'.php'] = $code.$this->endClass();
+
+            $files[$options['class'].'.php'] = $code;
             $hash = ucfirst(strtr(ContainerBuilder::hash($files), '._', 'xx'));
             $code = [];
 
@@ -305,7 +323,7 @@ return new \\Container{$hash}\\{$options['class']}([
 EOF;
         } else {
             $code .= $this->endClass();
-            foreach ($this->generateProxyClasses() as $c) {
+            foreach ($proxyClasses as $c) {
                 $code .= $c;
             }
         }
@@ -435,8 +453,9 @@ EOF;
         $lineage[$class] = substr($exportedFile, 1, -1);
     }
 
-    private function generateProxyClasses()
+    private function generateProxyClasses(): array
     {
+        $proxyClasses = [];
         $alreadyGenerated = [];
         $definitions = $this->container->getDefinitions();
         $strip = '' === $this->docStar && method_exists('Symfony\Component\HttpKernel\Kernel', 'stripComments');
@@ -455,19 +474,39 @@ EOF;
             if ("\n" === $proxyCode = "\n".$proxyDumper->getProxyCode($definition)) {
                 continue;
             }
+
+            if ($this->inlineRequires) {
+                $lineage = [];
+                $this->collectLineage($class, $lineage);
+
+                $code = '';
+                foreach (array_diff_key(array_flip($lineage), $this->inlinedRequires) as $file => $class) {
+                    if ($this->inlineFactories) {
+                        $this->inlinedRequires[$file] = true;
+                    }
+                    $file = preg_replace('#^\\$this->targetDirs\[(\d++)\]#', sprintf('\dirname(__DIR__, %d + $1)', $this->asFiles), $file);
+                    $code .= sprintf("include_once %s;\n", $file);
+                }
+
+                $proxyCode = $code.$proxyCode;
+            }
+
             if ($strip) {
                 $proxyCode = "<?php\n".$proxyCode;
                 $proxyCode = substr(Kernel::stripComments($proxyCode), 5);
             }
-            yield sprintf('%s.php', explode(' ', $proxyCode, 3)[1]) => $proxyCode;
+
+            $proxyClasses[sprintf('%s.php', explode(' ', $proxyCode, 3)[1])] = $proxyCode;
         }
+
+        return $proxyClasses;
     }
 
     private function addServiceInclude(string $cId, Definition $definition): string
     {
         $code = '';
 
-        if ($this->inlineRequires && !$this->isHotPath($definition)) {
+        if ($this->inlineRequires && (!$this->isHotPath($definition) || $this->getProxyDumper()->isProxyCandidate($definition))) {
             $lineage = [];
             foreach ($this->inlinedDefinitions as $def) {
                 if (!$def->isDeprecated() && \is_string($class = \is_array($factory = $def->getFactory()) && \is_string($factory[0]) ? $factory[0] : $def->getClass())) {
@@ -697,7 +736,7 @@ EOF;
             $lazyInitialization = '';
         }
 
-        $asFile = $this->asFiles && !$this->isHotPath($definition);
+        $asFile = $this->asFiles && !$this->inlineFactories && !$this->isHotPath($definition);
         $methodName = $this->generateMethodName($id);
         if ($asFile) {
             $file = $methodName.'.php';
@@ -723,17 +762,16 @@ EOF;
         $this->serviceCalls = [];
         $this->inlinedDefinitions = $this->getDefinitionsFromArguments([$definition], null, $this->serviceCalls);
 
-        $code .= $this->addServiceInclude($id, $definition);
+        if ($definition->isDeprecated()) {
+            $code .= sprintf("        @trigger_error(%s, E_USER_DEPRECATED);\n\n", $this->export($definition->getDeprecationMessage($id)));
+        }
 
         if ($this->getProxyDumper()->isProxyCandidate($definition)) {
             $factoryCode = $asFile ? ($definition->isShared() ? "\$this->load('%s.php', false)" : '$this->factories[%2$s](false)') : '$this->%s(false)';
             $code .= $this->getProxyDumper()->getProxyFactoryCode($definition, $id, sprintf($factoryCode, $methodName, $this->doExport($id)));
         }
 
-        if ($definition->isDeprecated()) {
-            $code .= sprintf("        @trigger_error(%s, E_USER_DEPRECATED);\n\n", $this->export($definition->getDeprecationMessage($id)));
-        }
-
+        $code .= $this->addServiceInclude($id, $definition);
         $code .= $this->addInlineService($id, $definition);
 
         if ($asFile) {
@@ -1048,7 +1086,7 @@ EOF;
 
         $code .= $this->addSyntheticIds();
         $code .= $this->addMethodMap();
-        $code .= $this->asFiles ? $this->addFileMap() : '';
+        $code .= $this->asFiles && !$this->inlineFactories ? $this->addFileMap() : '';
         $code .= $this->addAliases();
         $code .= $this->addInlineRequires();
         $code .= <<<EOF
@@ -1067,7 +1105,7 @@ EOF;
 EOF;
         $code .= $this->addRemovedIds();
 
-        if ($this->asFiles) {
+        if ($this->asFiles && !$this->inlineFactories) {
             $code .= <<<EOF
 
     protected function load(\$file, \$lazyLoad = true)
@@ -1083,10 +1121,10 @@ EOF;
             if (!$proxyDumper->isProxyCandidate($definition)) {
                 continue;
             }
-            if ($this->asFiles) {
+            if ($this->asFiles && !$this->inlineFactories) {
                 $proxyLoader = '$this->load("{$class}.php")';
-            } elseif ($this->namespace) {
-                $proxyLoader = 'class_alias("'.$this->namespace.'\\\\{$class}", $class, false)';
+            } elseif ($this->namespace || $this->inlineFactories) {
+                $proxyLoader = 'class_alias(__NAMESPACE__."\\\\$class", $class, false)';
             } else {
                 $proxyLoader = '';
             }
@@ -1164,7 +1202,7 @@ EOF;
         $definitions = $this->container->getDefinitions();
         ksort($definitions);
         foreach ($definitions as $id => $definition) {
-            if (!$definition->isSynthetic() && $definition->isPublic() && (!$this->asFiles || $this->isHotPath($definition))) {
+            if (!$definition->isSynthetic() && $definition->isPublic() && (!$this->asFiles || $this->inlineFactories || $this->isHotPath($definition))) {
                 $code .= '            '.$this->doExport($id).' => '.$this->doExport($this->generateMethodName($id)).",\n";
             }
         }
@@ -1261,6 +1299,11 @@ EOF;
 
         foreach ($this->container->findTaggedServiceIds($this->hotPathTag) as $id => $tags) {
             $definition = $this->container->getDefinition($id);
+
+            if ($this->getProxyDumper()->isProxyCandidate($definition)) {
+                continue;
+            }
+
             $inlinedDefinitions = $this->getDefinitionsFromArguments([$definition]);
 
             foreach ($inlinedDefinitions as $def) {
@@ -1606,7 +1649,7 @@ EOF;
                             continue;
                         }
                         $definition = $this->container->findDefinition($id = (string) $v);
-                        $load = !($definition->hasErrors() && $e = $definition->getErrors()) ? $this->asFiles && !$this->isHotPath($definition) : reset($e);
+                        $load = !($definition->hasErrors() && $e = $definition->getErrors()) ? $this->asFiles && !$this->inlineFactories && !$this->isHotPath($definition) : reset($e);
                         $serviceMap .= sprintf("\n            %s => [%s, %s, %s, %s],",
                             $this->export($k),
                             $this->export($definition->isShared() ? ($definition->isPublic() ? 'services' : 'privates') : false),
@@ -1749,7 +1792,7 @@ EOF;
                     $code = sprintf('$this->%s[%s] = %s', $definition->isPublic() ? 'services' : 'privates', $this->doExport($id), $code);
                 }
                 $code = "($code)";
-            } elseif ($this->asFiles && !$this->isHotPath($definition)) {
+            } elseif ($this->asFiles && !$this->inlineFactories && !$this->isHotPath($definition)) {
                 $code = sprintf("\$this->load('%s.php')", $this->generateMethodName($id));
                 if (!$definition->isShared()) {
                     $factory = sprintf('$this->factories%s[%s]', $definition->isPublic() ? '' : "['service_container']", $this->doExport($id));

src/Symfony/Component/DependencyInjection/Tests/Compiler/ExtensionCompilerPassTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Compiler;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\ExtensionCompilerPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -22,10 +23,12 @@ use Symfony\Component\DependencyInjection\Extension\Extension;
  */
 class ExtensionCompilerPassTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $container;
     private $pass;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->container = new ContainerBuilder();
         $this->pass = new ExtensionCompilerPass();

src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveParameterPlaceHoldersPassTest.php

@@ -12,16 +12,19 @@
 namespace Symfony\Component\DependencyInjection\Tests\Compiler;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\DependencyInjection\Compiler\ResolveParameterPlaceHoldersPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 class ResolveParameterPlaceHoldersPassTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private $compilerPass;
     private $container;
     private $fooDefinition;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->compilerPass = new ResolveParameterPlaceHoldersPass();
         $this->container = $this->createContainerBuilder();

src/Symfony/Component/DependencyInjection/Tests/Config/AutowireServiceResourceTest.php

@@ -0,0 +1,127 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Tests\Config;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
+use Symfony\Component\DependencyInjection\Compiler\AutowirePass;
+use Symfony\Component\DependencyInjection\Config\AutowireServiceResource;
+
+/**
+ * @group legacy
+ */
+class AutowireServiceResourceTest extends TestCase
+{
+    use ForwardCompatTestTrait;
+
+    /**
+     * @var AutowireServiceResource
+     */
+    private $resource;
+    private $file;
+    private $class;
+    private $time;
+
+    private function doSetUp()
+    {
+        $this->file = realpath(sys_get_temp_dir()).'/tmp.php';
+        $this->time = time();
+        touch($this->file, $this->time);
+
+        $this->class = __NAMESPACE__.'\Foo';
+        $this->resource = new AutowireServiceResource(
+            $this->class,
+            $this->file,
+            []
+        );
+    }
+
+    public function testToString()
+    {
+        $this->assertSame('service.autowire.'.$this->class, (string) $this->resource);
+    }
+
+    public function testSerializeUnserialize()
+    {
+        $unserialized = unserialize(serialize($this->resource));
+
+        $this->assertEquals($this->resource, $unserialized);
+    }
+
+    public function testIsFresh()
+    {
+        $this->assertTrue($this->resource->isFresh($this->time), '->isFresh() returns true if the resource has not changed in same second');
+        $this->assertTrue($this->resource->isFresh($this->time + 10), '->isFresh() returns true if the resource has not changed');
+        $this->assertFalse($this->resource->isFresh($this->time - 86400), '->isFresh() returns false if the resource has been updated');
+    }
+
+    public function testIsFreshForDeletedResources()
+    {
+        unlink($this->file);
+
+        $this->assertFalse($this->resource->isFresh($this->getStaleFileTime()), '->isFresh() returns false if the resource does not exist');
+    }
+
+    public function testIsNotFreshChangedResource()
+    {
+        $oldResource = new AutowireServiceResource(
+            $this->class,
+            $this->file,
+            ['will_be_different']
+        );
+
+        // test with a stale file *and* a resource that *will* be different than the actual
+        $this->assertFalse($oldResource->isFresh($this->getStaleFileTime()), '->isFresh() returns false if the constructor arguments have changed');
+    }
+
+    public function testIsFreshSameConstructorArgs()
+    {
+        $oldResource = AutowirePass::createResourceForClass(
+            new \ReflectionClass(__NAMESPACE__.'\Foo')
+        );
+
+        // test with a stale file *but* the resource will not be changed
+        $this->assertTrue($oldResource->isFresh($this->getStaleFileTime()), '->isFresh() returns false if the constructor arguments have changed');
+    }
+
+    public function testNotFreshIfClassNotFound()
+    {
+        $resource = new AutowireServiceResource(
+            'Some\Non\Existent\Class',
+            $this->file,
+            []
+        );
+
+        $this->assertFalse($resource->isFresh($this->getStaleFileTime()), '->isFresh() returns false if the class no longer exists');
+    }
+
+    private function doTearDown()
+    {
+        if (!file_exists($this->file)) {
+            return;
+        }
+
+        unlink($this->file);
+    }
+
+    private function getStaleFileTime()
+    {
+        return $this->time - 10;
+    }
+}
+
+class Foo
+{
+    public function __construct($foo)
+    {
+    }
+}

src/Symfony/Component/DependencyInjection/Tests/Config/ContainerParametersResourceCheckerTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Config;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\ResourceCheckerInterface;
 use Symfony\Component\DependencyInjection\Config\ContainerParametersResource;
 use Symfony\Component\DependencyInjection\Config\ContainerParametersResourceChecker;
@@ -19,6 +20,8 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
 
 class ContainerParametersResourceCheckerTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /** @var ContainerParametersResource */
     private $resource;
 
@@ -28,7 +31,7 @@ class ContainerParametersResourceCheckerTest extends TestCase
     /** @var ContainerInterface */
     private $container;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->resource = new ContainerParametersResource(['locales' => ['fr', 'en'], 'default_locale' => 'fr']);
         $this->container = $this->getMockBuilder(ContainerInterface::class)->getMock();

src/Symfony/Component/DependencyInjection/Tests/Config/ContainerParametersResourceTest.php

@@ -12,14 +12,17 @@
 namespace Symfony\Component\DependencyInjection\Tests\Config;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\DependencyInjection\Config\ContainerParametersResource;
 
 class ContainerParametersResourceTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     /** @var ContainerParametersResource */
     private $resource;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->resource = new ContainerParametersResource(['locales' => ['fr', 'en'], 'default_locale' => 'fr']);
     }

src/Symfony/Component/DependencyInjection/Tests/CrossCheckTest.php

@@ -12,14 +12,17 @@
 namespace Symfony\Component\DependencyInjection\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 class CrossCheckTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected static $fixturesPath;
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixturesPath = __DIR__.'/Fixtures/';
 

src/Symfony/Component/DependencyInjection/Tests/Dumper/GraphvizDumperTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Dumper\GraphvizDumper;
@@ -19,9 +20,11 @@ use Symfony\Component\DependencyInjection\Reference;
 
 class GraphvizDumperTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected static $fixturesPath;
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixturesPath = __DIR__.'/../Fixtures/';
     }

src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php

@@ -13,6 +13,8 @@ namespace Symfony\Component\DependencyInjection\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
 use Psr\Container\ContainerInterface;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
+use Symfony\Bridge\ProxyManager\LazyProxy\PhpDumper\ProxyDumper;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
 use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
@@ -42,12 +44,16 @@ use Symfony\Component\ExpressionLanguage\Expression;
 
 require_once __DIR__.'/../Fixtures/includes/autowiring_classes.php';
 require_once __DIR__.'/../Fixtures/includes/classes.php';
+require_once __DIR__.'/../Fixtures/includes/foo.php';
+require_once __DIR__.'/../Fixtures/includes/foo_lazy.php';
 
 class PhpDumperTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected static $fixturesPath;
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixturesPath = realpath(__DIR__.'/../Fixtures/');
     }
@@ -234,6 +240,59 @@ class PhpDumperTest extends TestCase
         $this->assertStringMatchesFormatFile(self::$fixturesPath.'/php/services9_as_files.txt', $dump);
     }
 
+    public function testDumpAsFilesWithFactoriesInlined()
+    {
+        $container = include self::$fixturesPath.'/containers/container9.php';
+        $container->setParameter('container.dumper.inline_factories', true);
+        $container->setParameter('container.dumper.inline_class_loader', true);
+
+        $container->getDefinition('bar')->addTag('hot');
+        $container->register('non_shared_foo', \Bar\FooClass::class)
+            ->setFile(realpath(self::$fixturesPath.'/includes/foo.php'))
+            ->setShared(false)
+            ->setPublic(true);
+        $container->register('throwing_one', \Bar\FooClass::class)
+            ->addArgument(new Reference('errored_one', ContainerBuilder::RUNTIME_EXCEPTION_ON_INVALID_REFERENCE))
+            ->setPublic(true);
+        $container->register('errored_one', 'stdClass')
+            ->addError('No-no-no-no');
+        $container->compile();
+
+        $dumper = new PhpDumper($container);
+        $dump = print_r($dumper->dump(['as_files' => true, 'file' => __DIR__, 'hot_path_tag' => 'hot', 'build_time' => 1563381341]), true);
+
+        if ('\\' === \DIRECTORY_SEPARATOR) {
+            $dump = str_replace('\\\\Fixtures\\\\includes\\\\', '/Fixtures/includes/', $dump);
+        }
+        $this->assertStringMatchesFormatFile(self::$fixturesPath.'/php/services9_inlined_factories.txt', $dump);
+    }
+
+    /**
+     * @requires function \Symfony\Bridge\ProxyManager\LazyProxy\PhpDumper\ProxyDumper::getProxyCode
+     */
+    public function testDumpAsFilesWithLazyFactoriesInlined()
+    {
+        $container = new ContainerBuilder();
+        $container->setParameter('container.dumper.inline_factories', true);
+        $container->setParameter('container.dumper.inline_class_loader', true);
+
+        $container->register('lazy_foo', \Bar\FooClass::class)
+            ->addArgument(new Definition(\Bar\FooLazyClass::class))
+            ->setPublic(true)
+            ->setLazy(true);
+
+        $container->compile();
+
+        $dumper = new PhpDumper($container);
+        $dumper->setProxyDumper(new ProxyDumper());
+        $dump = print_r($dumper->dump(['as_files' => true, 'file' => __DIR__, 'hot_path_tag' => 'hot', 'build_time' => 1563381341]), true);
+
+        if ('\\' === \DIRECTORY_SEPARATOR) {
+            $dump = str_replace('\\\\Fixtures\\\\includes\\\\', '/Fixtures/includes/', $dump);
+        }
+        $this->assertStringMatchesFormatFile(self::$fixturesPath.'/php/services9_lazy_inlined_factories.txt', $dump);
+    }
+
     public function testNonSharedLazyDumpAsFiles()
     {
         $container = include self::$fixturesPath.'/containers/container_non_shared_lazy.php';

src/Symfony/Component/DependencyInjection/Tests/Dumper/XmlDumperTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\Argument\ServiceLocatorArgument;
 use Symfony\Component\DependencyInjection\Argument\TaggedIteratorArgument;
@@ -23,9 +24,11 @@ use Symfony\Component\DependencyInjection\Reference;
 
 class XmlDumperTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected static $fixturesPath;
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixturesPath = realpath(__DIR__.'/../Fixtures/');
     }

src/Symfony/Component/DependencyInjection/Tests/Dumper/YamlDumperTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\Argument\ServiceLocatorArgument;
 use Symfony\Component\DependencyInjection\Argument\TaggedIteratorArgument;
@@ -26,9 +27,11 @@ use Symfony\Component\Yaml\Yaml;
 
 class YamlDumperTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected static $fixturesPath;
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixturesPath = realpath(__DIR__.'/../Fixtures/');
     }

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_inlined_factories.txt

@@ -0,0 +1,572 @@
+Array
+(
+    [Container%s/removed-ids.php] => <?php
+
+return [
+    'Psr\\Container\\ContainerInterface' => true,
+    'Symfony\\Component\\DependencyInjection\\ContainerInterface' => true,
+    'configurator_service' => true,
+    'configurator_service_simple' => true,
+    'decorated.pif-pouf' => true,
+    'decorator_service.inner' => true,
+    'errored_definition' => true,
+    'errored_one' => true,
+    'factory_simple' => true,
+    'inlined' => true,
+    'new_factory' => true,
+    'tagged_iterator_foo' => true,
+];
+
+    [Container%s/ProjectServiceContainer.php] => <?php
+
+namespace Container%s;
+
+use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Exception\LogicException;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
+
+/**
+ * This class has been auto-generated
+ * by the Symfony Dependency Injection Component.
+ *
+ * @final since Symfony 3.3
+ */
+class ProjectServiceContainer extends Container
+{
+    private $buildParameters;
+    private $containerDir;
+    private $parameters;
+    private $targetDirs = [];
+
+    public function __construct(array $buildParameters = [], $containerDir = __DIR__)
+    {
+        $dir = $this->targetDirs[0] = \dirname($containerDir);
+        for ($i = 1; $i <= 5; ++$i) {
+            $this->targetDirs[$i] = $dir = \dirname($dir);
+        }
+        $this->buildParameters = $buildParameters;
+        $this->containerDir = $containerDir;
+        $this->parameters = $this->getDefaultParameters();
+
+        $this->services = $this->privates = [];
+        $this->syntheticIds = [
+            'request' => true,
+        ];
+        $this->methodMap = [
+            'BAR' => 'getBARService',
+            'BAR2' => 'getBAR2Service',
+            'bar' => 'getBar3Service',
+            'bar2' => 'getBar22Service',
+            'baz' => 'getBazService',
+            'configured_service' => 'getConfiguredServiceService',
+            'configured_service_simple' => 'getConfiguredServiceSimpleService',
+            'decorator_service' => 'getDecoratorServiceService',
+            'decorator_service_with_name' => 'getDecoratorServiceWithNameService',
+            'deprecated_service' => 'getDeprecatedServiceService',
+            'factory_service' => 'getFactoryServiceService',
+            'factory_service_simple' => 'getFactoryServiceSimpleService',
+            'foo' => 'getFooService',
+            'foo.baz' => 'getFoo_BazService',
+            'foo_bar' => 'getFooBarService',
+            'foo_with_inline' => 'getFooWithInlineService',
+            'lazy_context' => 'getLazyContextService',
+            'lazy_context_ignore_invalid_ref' => 'getLazyContextIgnoreInvalidRefService',
+            'method_call1' => 'getMethodCall1Service',
+            'new_factory_service' => 'getNewFactoryServiceService',
+            'non_shared_foo' => 'getNonSharedFooService',
+            'runtime_error' => 'getRuntimeErrorService',
+            'service_from_static_method' => 'getServiceFromStaticMethodService',
+            'tagged_iterator' => 'getTaggedIteratorService',
+            'throwing_one' => 'getThrowingOneService',
+        ];
+        $this->aliases = [
+            'alias_for_alias' => 'foo',
+            'alias_for_foo' => 'foo',
+            'decorated' => 'decorator_service_with_name',
+        ];
+
+        $this->privates['service_container'] = function () {
+            include_once $this->targetDirs[0].'/Fixtures/includes/foo.php';
+        };
+    }
+
+    public function compile()
+    {
+        throw new LogicException('You cannot compile a dumped container that was already compiled.');
+    }
+
+    public function isCompiled()
+    {
+        return true;
+    }
+
+    public function getRemovedIds()
+    {
+        return require $this->containerDir.\DIRECTORY_SEPARATOR.'removed-ids.php';
+    }
+
+    /**
+     * Gets the public 'BAR' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getBARService()
+    {
+        $this->services['BAR'] = $instance = new \stdClass();
+
+        $instance->bar = ($this->services['bar'] ?? $this->getBar3Service());
+
+        return $instance;
+    }
+
+    /**
+     * Gets the public 'BAR2' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getBAR2Service()
+    {
+        return $this->services['BAR2'] = new \stdClass();
+    }
+
+    /**
+     * Gets the public 'bar' shared service.
+     *
+     * @return \Bar\FooClass
+     */
+    protected function getBar3Service()
+    {
+        $a = ($this->services['foo.baz'] ?? $this->getFoo_BazService());
+
+        $this->services['bar'] = $instance = new \Bar\FooClass('foo', $a, $this->getParameter('foo_bar'));
+
+        $a->configure($instance);
+
+        return $instance;
+    }
+
+    /**
+     * Gets the public 'bar2' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getBar22Service()
+    {
+        return $this->services['bar2'] = new \stdClass();
+    }
+
+    /**
+     * Gets the public 'baz' shared service.
+     *
+     * @return \Baz
+     */
+    protected function getBazService()
+    {
+        $this->services['baz'] = $instance = new \Baz();
+
+        $instance->setFoo(($this->services['foo_with_inline'] ?? $this->getFooWithInlineService()));
+
+        return $instance;
+    }
+
+    /**
+     * Gets the public 'configured_service' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getConfiguredServiceService()
+    {
+        $this->services['configured_service'] = $instance = new \stdClass();
+
+        $a = new \ConfClass();
+        $a->setFoo(($this->services['baz'] ?? $this->getBazService()));
+
+        $a->configureStdClass($instance);
+
+        return $instance;
+    }
+
+    /**
+     * Gets the public 'configured_service_simple' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getConfiguredServiceSimpleService()
+    {
+        $this->services['configured_service_simple'] = $instance = new \stdClass();
+
+        (new \ConfClass('bar'))->configureStdClass($instance);
+
+        return $instance;
+    }
+
+    /**
+     * Gets the public 'decorator_service' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getDecoratorServiceService()
+    {
+        return $this->services['decorator_service'] = new \stdClass();
+    }
+
+    /**
+     * Gets the public 'decorator_service_with_name' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getDecoratorServiceWithNameService()
+    {
+        return $this->services['decorator_service_with_name'] = new \stdClass();
+    }
+
+    /**
+     * Gets the public 'deprecated_service' shared service.
+     *
+     * @return \stdClass
+     *
+     * @deprecated The "deprecated_service" service is deprecated. You should stop using it, as it will be removed in the future.
+     */
+    protected function getDeprecatedServiceService()
+    {
+        @trigger_error('The "deprecated_service" service is deprecated. You should stop using it, as it will be removed in the future.', E_USER_DEPRECATED);
+
+        return $this->services['deprecated_service'] = new \stdClass();
+    }
+
+    /**
+     * Gets the public 'factory_service' shared service.
+     *
+     * @return \Bar
+     */
+    protected function getFactoryServiceService()
+    {
+        return $this->services['factory_service'] = ($this->services['foo.baz'] ?? $this->getFoo_BazService())->getInstance();
+    }
+
+    /**
+     * Gets the public 'factory_service_simple' shared service.
+     *
+     * @return \Bar
+     */
+    protected function getFactoryServiceSimpleService()
+    {
+        return $this->services['factory_service_simple'] = $this->getFactorySimpleService()->getInstance();
+    }
+
+    /**
+     * Gets the public 'foo' shared service.
+     *
+     * @return \Bar\FooClass
+     */
+    protected function getFooService()
+    {
+        $a = ($this->services['foo.baz'] ?? $this->getFoo_BazService());
+
+        $this->services['foo'] = $instance = \Bar\FooClass::getInstance('foo', $a, ['bar' => 'foo is bar', 'foobar' => 'bar'], true, $this);
+
+        $instance->foo = 'bar';
+        $instance->moo = $a;
+        $instance->qux = ['bar' => 'foo is bar', 'foobar' => 'bar'];
+        $instance->setBar(($this->services['bar'] ?? $this->getBar3Service()));
+        $instance->initialize();
+        sc_configure($instance);
+
+        return $instance;
+    }
+
+    /**
+     * Gets the public 'foo.baz' shared service.
+     *
+     * @return \BazClass
+     */
+    protected function getFoo_BazService()
+    {
+        include_once $this->targetDirs[0].'/Fixtures/includes/classes.php';
+
+        $this->services['foo.baz'] = $instance = \BazClass::getInstance();
+
+        \BazClass::configureStatic1($instance);
+
+        return $instance;
+    }
+
+    /**
+     * Gets the public 'foo_bar' service.
+     *
+     * @return \Bar\FooClass
+     */
+    protected function getFooBarService()
+    {
+        return new \Bar\FooClass(($this->services['deprecated_service'] ?? $this->getDeprecatedServiceService()));
+    }
+
+    /**
+     * Gets the public 'foo_with_inline' shared service.
+     *
+     * @return \Foo
+     */
+    protected function getFooWithInlineService()
+    {
+        $this->services['foo_with_inline'] = $instance = new \Foo();
+
+        $a = new \Bar();
+        $a->pub = 'pub';
+        $a->setBaz(($this->services['baz'] ?? $this->getBazService()));
+
+        $instance->setBar($a);
+
+        return $instance;
+    }
+
+    /**
+     * Gets the public 'lazy_context' shared service.
+     *
+     * @return \LazyContext
+     */
+    protected function getLazyContextService()
+    {
+        include_once $this->targetDirs[0].'/Fixtures/includes/classes.php';
+
+        return $this->services['lazy_context'] = new \LazyContext(new RewindableGenerator(function () {
+            yield 'k1' => ($this->services['foo.baz'] ?? $this->getFoo_BazService());
+            yield 'k2' => $this;
+        }, 2), new RewindableGenerator(function () {
+            return new \EmptyIterator();
+        }, 0));
+    }
+
+    /**
+     * Gets the public 'lazy_context_ignore_invalid_ref' shared service.
+     *
+     * @return \LazyContext
+     */
+    protected function getLazyContextIgnoreInvalidRefService()
+    {
+        include_once $this->targetDirs[0].'/Fixtures/includes/classes.php';
+
+        return $this->services['lazy_context_ignore_invalid_ref'] = new \LazyContext(new RewindableGenerator(function () {
+            yield 0 => ($this->services['foo.baz'] ?? $this->getFoo_BazService());
+        }, 1), new RewindableGenerator(function () {
+            return new \EmptyIterator();
+        }, 0));
+    }
+
+    /**
+     * Gets the public 'method_call1' shared service.
+     *
+     * @return \Bar\FooClass
+     */
+    protected function getMethodCall1Service()
+    {
+        include_once ($this->targetDirs[0].'/Fixtures/includes/foo.php');
+
+        $this->services['method_call1'] = $instance = new \Bar\FooClass();
+
+        $instance->setBar(($this->services['foo'] ?? $this->getFooService()));
+        $instance->setBar(NULL);
+        $instance->setBar((($this->services['foo'] ?? $this->getFooService())->foo() . (($this->hasParameter("foo")) ? ($this->getParameter("foo")) : ("default"))));
+
+        return $instance;
+    }
+
+    /**
+     * Gets the public 'new_factory_service' shared service.
+     *
+     * @return \FooBarBaz
+     */
+    protected function getNewFactoryServiceService()
+    {
+        $a = new \FactoryClass();
+        $a->foo = 'bar';
+
+        $this->services['new_factory_service'] = $instance = $a->getInstance();
+
+        $instance->foo = 'bar';
+
+        return $instance;
+    }
+
+    /**
+     * Gets the public 'non_shared_foo' service.
+     *
+     * @return \Bar\FooClass
+     */
+    protected function getNonSharedFooService()
+    {
+        include_once ($this->targetDirs[0].'/Fixtures/includes/foo.php');
+
+        return new \Bar\FooClass();
+    }
+
+    /**
+     * Gets the public 'runtime_error' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getRuntimeErrorService()
+    {
+        return $this->services['runtime_error'] = new \stdClass($this->throw('Service "errored_definition" is broken.'));
+    }
+
+    /**
+     * Gets the public 'service_from_static_method' shared service.
+     *
+     * @return \Bar\FooClass
+     */
+    protected function getServiceFromStaticMethodService()
+    {
+        return $this->services['service_from_static_method'] = \Bar\FooClass::getInstance();
+    }
+
+    /**
+     * Gets the public 'tagged_iterator' shared service.
+     *
+     * @return \Bar
+     */
+    protected function getTaggedIteratorService()
+    {
+        return $this->services['tagged_iterator'] = new \Bar(new RewindableGenerator(function () {
+            yield 0 => ($this->services['foo'] ?? $this->getFooService());
+            yield 1 => ($this->privates['tagged_iterator_foo'] ?? ($this->privates['tagged_iterator_foo'] = new \Bar()));
+        }, 2));
+    }
+
+    /**
+     * Gets the public 'throwing_one' shared service.
+     *
+     * @return \Bar\FooClass
+     */
+    protected function getThrowingOneService()
+    {
+        return $this->services['throwing_one'] = new \Bar\FooClass($this->throw('No-no-no-no'));
+    }
+
+    /**
+     * Gets the private 'factory_simple' shared service.
+     *
+     * @return \SimpleFactoryClass
+     *
+     * @deprecated The "factory_simple" service is deprecated. You should stop using it, as it will be removed in the future.
+     */
+    protected function getFactorySimpleService()
+    {
+        @trigger_error('The "factory_simple" service is deprecated. You should stop using it, as it will be removed in the future.', E_USER_DEPRECATED);
+
+        return new \SimpleFactoryClass('foo');
+    }
+
+    public function getParameter($name)
+    {
+        $name = (string) $name;
+        if (isset($this->buildParameters[$name])) {
+            return $this->buildParameters[$name];
+        }
+
+        if (!(isset($this->parameters[$name]) || isset($this->loadedDynamicParameters[$name]) || array_key_exists($name, $this->parameters))) {
+            throw new InvalidArgumentException(sprintf('The parameter "%s" must be defined.', $name));
+        }
+        if (isset($this->loadedDynamicParameters[$name])) {
+            return $this->loadedDynamicParameters[$name] ? $this->dynamicParameters[$name] : $this->getDynamicParameter($name);
+        }
+
+        return $this->parameters[$name];
+    }
+
+    public function hasParameter($name)
+    {
+        $name = (string) $name;
+        if (isset($this->buildParameters[$name])) {
+            return true;
+        }
+
+        return isset($this->parameters[$name]) || isset($this->loadedDynamicParameters[$name]) || array_key_exists($name, $this->parameters);
+    }
+
+    public function setParameter($name, $value)
+    {
+        throw new LogicException('Impossible to call set() on a frozen ParameterBag.');
+    }
+
+    public function getParameterBag()
+    {
+        if (null === $this->parameterBag) {
+            $parameters = $this->parameters;
+            foreach ($this->loadedDynamicParameters as $name => $loaded) {
+                $parameters[$name] = $loaded ? $this->dynamicParameters[$name] : $this->getDynamicParameter($name);
+            }
+            foreach ($this->buildParameters as $name => $value) {
+                $parameters[$name] = $value;
+            }
+            $this->parameterBag = new FrozenParameterBag($parameters);
+        }
+
+        return $this->parameterBag;
+    }
+
+    private $loadedDynamicParameters = [];
+    private $dynamicParameters = [];
+
+    /**
+     * Computes a dynamic parameter.
+     *
+     * @param string $name The name of the dynamic parameter to load
+     *
+     * @return mixed The value of the dynamic parameter
+     *
+     * @throws InvalidArgumentException When the dynamic parameter does not exist
+     */
+    private function getDynamicParameter($name)
+    {
+        throw new InvalidArgumentException(sprintf('The dynamic parameter "%s" must be defined.', $name));
+    }
+
+    /**
+     * Gets the default parameters.
+     *
+     * @return array An array of the default parameters
+     */
+    protected function getDefaultParameters()
+    {
+        return [
+            'baz_class' => 'BazClass',
+            'foo_class' => 'Bar\\FooClass',
+            'foo' => 'bar',
+            'container.dumper.inline_factories' => true,
+            'container.dumper.inline_class_loader' => true,
+        ];
+    }
+
+    protected function throw($message)
+    {
+        throw new RuntimeException($message);
+    }
+}
+
+    [ProjectServiceContainer.php] => <?php
+
+// This file has been auto-generated by the Symfony Dependency Injection Component for internal use.
+
+if (\class_exists(\Container%s\ProjectServiceContainer::class, false)) {
+    // no-op
+} elseif (!include __DIR__.'/Container%s/ProjectServiceContainer.php') {
+    touch(__DIR__.'/Container%s.legacy');
+
+    return;
+}
+
+if (!\class_exists(ProjectServiceContainer::class, false)) {
+    \class_alias(\Container%s\ProjectServiceContainer::class, ProjectServiceContainer::class, false);
+}
+
+return new \Container%s\ProjectServiceContainer([
+    'container.build_hash' => '%s',
+    'container.build_id' => '%s',
+    'container.build_time' => 1563381341,
+], __DIR__.\DIRECTORY_SEPARATOR.'Container%s');
+
+)

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_lazy_inlined_factories.txt

@@ -0,0 +1,206 @@
+Array
+(
+    [Container%s/removed-ids.php] => <?php
+
+return [
+    'Psr\\Container\\ContainerInterface' => true,
+    'Symfony\\Component\\DependencyInjection\\ContainerInterface' => true,
+];
+
+    [Container%s/ProjectServiceContainer.php] => <?php
+
+namespace Container%s;
+
+use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Exception\LogicException;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
+
+/**
+ * This class has been auto-generated
+ * by the Symfony Dependency Injection Component.
+ *
+ * @final since Symfony 3.3
+ */
+class ProjectServiceContainer extends Container
+{
+    private $buildParameters;
+    private $containerDir;
+    private $parameters;
+    private $targetDirs = [];
+
+    public function __construct(array $buildParameters = [], $containerDir = __DIR__)
+    {
+        $dir = $this->targetDirs[0] = \dirname($containerDir);
+        for ($i = 1; $i <= 5; ++$i) {
+            $this->targetDirs[$i] = $dir = \dirname($dir);
+        }
+        $this->buildParameters = $buildParameters;
+        $this->containerDir = $containerDir;
+        $this->parameters = $this->getDefaultParameters();
+
+        $this->services = $this->privates = [];
+        $this->methodMap = [
+            'lazy_foo' => 'getLazyFooService',
+        ];
+
+        $this->aliases = [];
+    }
+
+    public function compile()
+    {
+        throw new LogicException('You cannot compile a dumped container that was already compiled.');
+    }
+
+    public function isCompiled()
+    {
+        return true;
+    }
+
+    public function getRemovedIds()
+    {
+        return require $this->containerDir.\DIRECTORY_SEPARATOR.'removed-ids.php';
+    }
+
+    protected function createProxy($class, \Closure $factory)
+    {
+        class_exists($class, false) || class_alias(__NAMESPACE__."\\$class", $class, false);
+
+        return $factory();
+    }
+
+    /**
+     * Gets the public 'lazy_foo' shared service.
+     *
+     * @return \Bar\FooClass
+     */
+    protected function getLazyFooService($lazyLoad = true)
+    {
+        if ($lazyLoad) {
+            return $this->services['lazy_foo'] = $this->createProxy('FooClass_%s', function () {
+                return \FooClass_%s::staticProxyConstructor(function (&$wrappedInstance, \ProxyManager\Proxy\LazyLoadingInterface $proxy) {
+                    $wrappedInstance = $this->getLazyFooService(false);
+
+                    $proxy->setProxyInitializer(null);
+
+                    return true;
+                });
+            });
+        }
+
+        include_once $this->targetDirs[0].'/Fixtures/includes/foo_lazy.php';
+
+        return new \Bar\FooClass(new \Bar\FooLazyClass());
+    }
+
+    public function getParameter($name)
+    {
+        $name = (string) $name;
+        if (isset($this->buildParameters[$name])) {
+            return $this->buildParameters[$name];
+        }
+
+        if (!(isset($this->parameters[$name]) || isset($this->loadedDynamicParameters[$name]) || array_key_exists($name, $this->parameters))) {
+            throw new InvalidArgumentException(sprintf('The parameter "%s" must be defined.', $name));
+        }
+        if (isset($this->loadedDynamicParameters[$name])) {
+            return $this->loadedDynamicParameters[$name] ? $this->dynamicParameters[$name] : $this->getDynamicParameter($name);
+        }
+
+        return $this->parameters[$name];
+    }
+
+    public function hasParameter($name)
+    {
+        $name = (string) $name;
+        if (isset($this->buildParameters[$name])) {
+            return true;
+        }
+
+        return isset($this->parameters[$name]) || isset($this->loadedDynamicParameters[$name]) || array_key_exists($name, $this->parameters);
+    }
+
+    public function setParameter($name, $value)
+    {
+        throw new LogicException('Impossible to call set() on a frozen ParameterBag.');
+    }
+
+    public function getParameterBag()
+    {
+        if (null === $this->parameterBag) {
+            $parameters = $this->parameters;
+            foreach ($this->loadedDynamicParameters as $name => $loaded) {
+                $parameters[$name] = $loaded ? $this->dynamicParameters[$name] : $this->getDynamicParameter($name);
+            }
+            foreach ($this->buildParameters as $name => $value) {
+                $parameters[$name] = $value;
+            }
+            $this->parameterBag = new FrozenParameterBag($parameters);
+        }
+
+        return $this->parameterBag;
+    }
+
+    private $loadedDynamicParameters = [];
+    private $dynamicParameters = [];
+
+    /**
+     * Computes a dynamic parameter.
+     *
+     * @param string $name The name of the dynamic parameter to load
+     *
+     * @return mixed The value of the dynamic parameter
+     *
+     * @throws InvalidArgumentException When the dynamic parameter does not exist
+     */
+    private function getDynamicParameter($name)
+    {
+        throw new InvalidArgumentException(sprintf('The dynamic parameter "%s" must be defined.', $name));
+    }
+
+    /**
+     * Gets the default parameters.
+     *
+     * @return array An array of the default parameters
+     */
+    protected function getDefaultParameters()
+    {
+        return [
+            'container.dumper.inline_factories' => true,
+            'container.dumper.inline_class_loader' => true,
+        ];
+    }
+}
+include_once \dirname(__DIR__, 1 + 0).'/Fixtures/includes/foo.php';
+
+class FooClass_%s extends \Bar\FooClass implements \ProxyManager\Proxy\VirtualProxyInterface
+{
+%A
+}
+
+    [ProjectServiceContainer.php] => <?php
+
+// This file has been auto-generated by the Symfony Dependency Injection Component for internal use.
+
+if (\class_exists(\Container%s\ProjectServiceContainer::class, false)) {
+    // no-op
+} elseif (!include __DIR__.'/Container%s/ProjectServiceContainer.php') {
+    touch(__DIR__.'/Container%s.legacy');
+
+    return;
+}
+
+if (!\class_exists(ProjectServiceContainer::class, false)) {
+    \class_alias(\Container%s\ProjectServiceContainer::class, ProjectServiceContainer::class, false);
+}
+
+return new \Container%s\ProjectServiceContainer([
+    'container.build_hash' => '%s',
+    'container.build_id' => '%s',
+    'container.build_time' => 1563381341,
+], __DIR__.\DIRECTORY_SEPARATOR.'Container%s');
+
+)

src/Symfony/Component/DependencyInjection/Tests/Loader/DirectoryLoaderTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Config\Loader\LoaderResolver;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -22,17 +23,19 @@ use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 
 class DirectoryLoaderTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private static $fixturesPath;
 
     private $container;
     private $loader;
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixturesPath = realpath(__DIR__.'/../Fixtures/');
     }
 
-    protected function setUp()
+    private function doSetUp()
     {
         $locator = new FileLocator(self::$fixturesPath);
         $this->container = new ContainerBuilder();

src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php

@@ -13,6 +13,7 @@ namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
 use Psr\Container\ContainerInterface as PsrContainerInterface;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Config\Loader\LoaderResolver;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -34,9 +35,11 @@ use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\Sub\BarInterf
 
 class FileLoaderTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected static $fixturesPath;
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixturesPath = realpath(__DIR__.'/../');
     }

src/Symfony/Component/DependencyInjection/Tests/Loader/IniFileLoaderTest.php

@@ -12,16 +12,19 @@
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\IniFileLoader;
 
 class IniFileLoaderTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected $container;
     protected $loader;
 
-    protected function setUp()
+    private function doSetUp()
     {
         $this->container = new ContainerBuilder();
         $this->loader = new IniFileLoader($this->container, new FileLocator(realpath(__DIR__.'/../Fixtures/').'/ini'));

src/Symfony/Component/DependencyInjection/Tests/Loader/LoaderResolverTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Config\Loader\LoaderResolver;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -23,12 +24,14 @@ use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 
 class LoaderResolverTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     private static $fixturesPath;
 
     /** @var LoaderResolver */
     private $resolver;
 
-    protected function setUp()
+    private function doSetUp()
     {
         self::$fixturesPath = realpath(__DIR__.'/../Fixtures/');
 

src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Config\Loader\LoaderResolver;
 use Symfony\Component\Config\Resource\FileResource;
@@ -36,9 +37,11 @@ use Symfony\Component\ExpressionLanguage\Expression;
 
 class XmlFileLoaderTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     protected static $fixturesPath;
 
-    public static function setUpBeforeClass()
+    private static function doSetUpBeforeClass()
     {
         self::$fixturesPath = realpath(__DIR__.'/../Fixtures/');
         require_once self::$fixturesPath.'/includes/foo.php';