diff --git a/link b/link
index a5030d0683..6a2ec15e22 100755
--- a/link
+++ b/link
@@ -37,7 +37,12 @@ if (!is_dir("$argv[1]/vendor/symfony")) {
 $sfPackages = array('symfony/symfony' => __DIR__);
 
 $filesystem = new Filesystem();
-foreach (glob(__DIR__.'/src/Symfony/{Bundle,Bridge,Component,Component/Security}/*', GLOB_BRACE | GLOB_ONLYDIR | GLOB_NOSORT) as $dir) {
+$braces = array('Bundle', 'Bridge', 'Component', 'Component/Security');
+$directories = call_user_func_array('array_merge', array_values(array_map(function ($part) {
+    return glob(__DIR__.'/src/Symfony/'.$part.'/*', GLOB_ONLYDIR | GLOB_NOSORT);
+}, $braces)));
+
+foreach ($directories as $dir) {
     if ($filesystem->exists($composer = "$dir/composer.json")) {
         $sfPackages[json_decode(file_get_contents($composer))->name] = $dir;
     }
diff --git a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php
index 0e0078cd2f..44cbf9e618 100644
--- a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php
+++ b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php
@@ -215,41 +215,62 @@ class DeprecationErrorHandler
                     return $b['count'] - $a['count'];
                 };
 
-                $groups = array('unsilenced', 'remaining');
-                if (DeprecationErrorHandler::MODE_WEAK_VENDORS === $mode) {
-                    $groups[] = 'remaining vendor';
-                }
-                array_push($groups, 'legacy', 'other');
+                $displayDeprecations = function ($deprecations) use ($colorize, $cmp) {
+                    $groups = array('unsilenced', 'remaining');
+                    if (DeprecationErrorHandler::MODE_WEAK_VENDORS === $mode) {
+                        $groups[] = 'remaining vendor';
+                    }
+                    array_push($groups, 'legacy', 'other');
 
-                foreach ($groups as $group) {
-                    if ($deprecations[$group.'Count']) {
-                        echo "\n", $colorize(
-                            sprintf('%s deprecation notices (%d)', ucfirst($group), $deprecations[$group.'Count']),
-                            'legacy' !== $group && 'remaining vendor' !== $group
-                        ), "\n";
+                    foreach ($groups as $group) {
+                        if ($deprecations[$group.'Count']) {
+                            echo "\n", $colorize(
+                                sprintf('%s deprecation notices (%d)', ucfirst($group), $deprecations[$group.'Count']),
+                                'legacy' !== $group && 'remaining vendor' !== $group
+                            ), "\n";
 
-                        uasort($deprecations[$group], $cmp);
+                            uasort($deprecations[$group], $cmp);
 
-                        foreach ($deprecations[$group] as $msg => $notices) {
-                            echo "\n  ", $notices['count'], 'x: ', $msg, "\n";
+                            foreach ($deprecations[$group] as $msg => $notices) {
+                                echo "\n  ", $notices['count'], 'x: ', $msg, "\n";
 
-                            arsort($notices);
+                                arsort($notices);
 
-                            foreach ($notices as $method => $count) {
-                                if ('count' !== $method) {
-                                    echo '    ', $count, 'x in ', preg_replace('/(.*)\\\\(.*?::.*?)$/', '$2 from $1', $method), "\n";
+                                foreach ($notices as $method => $count) {
+                                    if ('count' !== $method) {
+                                        echo '    ', $count, 'x in ', preg_replace('/(.*)\\\\(.*?::.*?)$/', '$2 from $1', $method), "\n";
+                                    }
                                 }
                             }
                         }
                     }
-                }
-                if (!empty($notices)) {
-                    echo "\n";
+                    if (!empty($notices)) {
+                        echo "\n";
+                    }
+                };
+
+                $displayDeprecations($deprecations);
+
+                // store failing status
+                $isFailing = DeprecationErrorHandler::MODE_WEAK !== $mode && $mode < $deprecations['unsilencedCount'] + $deprecations['remainingCount'] + $deprecations['otherCount'];
+
+                // reset deprecations array
+                foreach ($deprecations as $group => $arrayOrInt) {
+                    $deprecations[$group] = is_int($arrayOrInt) ? 0 : array();
                 }
 
-                if (DeprecationErrorHandler::MODE_WEAK !== $mode && $mode < $deprecations['unsilencedCount'] + $deprecations['remainingCount'] + $deprecations['otherCount']) {
-                    exit(1);
-                }
+                register_shutdown_function(function () use (&$deprecations, $isFailing, $displayDeprecations, $mode) {
+                    foreach ($deprecations as $group => $arrayOrInt) {
+                        if (0 < (is_int($arrayOrInt) ? $arrayOrInt : count($arrayOrInt))) {
+                            echo "Shutdown-time deprecations:\n";
+                            break;
+                        }
+                    }
+                    $displayDeprecations($deprecations);
+                    if ($isFailing || DeprecationErrorHandler::MODE_WEAK !== $mode && $mode < $deprecations['unsilencedCount'] + $deprecations['remainingCount'] + $deprecations['otherCount']) {
+                        exit(1);
+                    }
+                });
             });
         }
     }
diff --git a/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/default.phpt b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/default.phpt
index 39a3e98586..7a0595a7dd 100644
--- a/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/default.phpt
+++ b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/default.phpt
@@ -59,6 +59,10 @@ $foo = new FooTestCase();
 $foo->testLegacyFoo();
 $foo->testNonLegacyBar();
 
+register_shutdown_function(function () {
+    exit('I get precedence over any exit statements inside the deprecation error handler.');
+});
+
 ?>
 --EXPECTF--
 Unsilenced deprecation notices (3)
@@ -80,3 +84,4 @@ Other deprecation notices (1)
 
   1x: root deprecation
 
+I get precedence over any exit statements inside the deprecation error handler.
diff --git a/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/shutdown_deprecations.phpt b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/shutdown_deprecations.phpt
new file mode 100644
index 0000000000..fddeed6085
--- /dev/null
+++ b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/shutdown_deprecations.phpt
@@ -0,0 +1,91 @@
+--TEST--
+Test DeprecationErrorHandler in default mode
+--FILE--
+<?php
+
+putenv('SYMFONY_DEPRECATIONS_HELPER');
+putenv('ANSICON');
+putenv('ConEmuANSI');
+putenv('TERM');
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = dirname($vendor);
+}
+define('PHPUNIT_COMPOSER_INSTALL', $vendor.'/vendor/autoload.php');
+require PHPUNIT_COMPOSER_INSTALL;
+require_once __DIR__.'/../../bootstrap.php';
+
+@trigger_error('root deprecation', E_USER_DEPRECATED);
+
+eval(<<<'EOPHP'
+namespace PHPUnit\Util;
+
+class Test
+{
+    public static function getGroups()
+    {
+        return array();
+    }
+}
+EOPHP
+);
+
+class PHPUnit_Util_Test
+{
+    public static function getGroups()
+    {
+        return array();
+    }
+}
+
+class FooTestCase
+{
+    public function testLegacyFoo()
+    {
+        @trigger_error('silenced foo deprecation', E_USER_DEPRECATED);
+        trigger_error('unsilenced foo deprecation', E_USER_DEPRECATED);
+        trigger_error('unsilenced foo deprecation', E_USER_DEPRECATED);
+    }
+
+    public function testNonLegacyBar()
+    {
+        @trigger_error('silenced bar deprecation', E_USER_DEPRECATED);
+        trigger_error('unsilenced bar deprecation', E_USER_DEPRECATED);
+    }
+}
+
+$foo = new FooTestCase();
+$foo->testLegacyFoo();
+$foo->testNonLegacyBar();
+
+register_shutdown_function(function () {
+    @trigger_error('root deprecation during shutdown', E_USER_DEPRECATED);
+});
+
+?>
+--EXPECTF--
+Unsilenced deprecation notices (3)
+
+  2x: unsilenced foo deprecation
+    2x in FooTestCase::testLegacyFoo
+
+  1x: unsilenced bar deprecation
+    1x in FooTestCase::testNonLegacyBar
+
+Remaining deprecation notices (1)
+
+  1x: silenced bar deprecation
+    1x in FooTestCase::testNonLegacyBar
+
+Legacy deprecation notices (1)
+
+Other deprecation notices (1)
+
+  1x: root deprecation
+
+Shutdown-time deprecations:
+
+Other deprecation notices (1)
+
+  1x: root deprecation during shutdown
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddCacheWarmerPassTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddCacheWarmerPassTest.php
index 1f49022f8d..d06fcc5fd3 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddCacheWarmerPassTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddCacheWarmerPassTest.php
@@ -24,8 +24,7 @@ class AddCacheWarmerPassTest extends TestCase
     public function testThatCacheWarmersAreProcessedInPriorityOrder()
     {
         $container = new ContainerBuilder();
-
-        $definition = $container->register('cache_warmer')->addArgument(null);
+        $cacheWarmerDefinition = $container->register('cache_warmer')->addArgument(array());
         $container->register('my_cache_warmer_service1')->addTag('kernel.cache_warmer', array('priority' => 100));
         $container->register('my_cache_warmer_service2')->addTag('kernel.cache_warmer', array('priority' => 200));
         $container->register('my_cache_warmer_service3')->addTag('kernel.cache_warmer');
@@ -33,48 +32,35 @@ class AddCacheWarmerPassTest extends TestCase
         $addCacheWarmerPass = new AddCacheWarmerPass();
         $addCacheWarmerPass->process($container);
 
-        $expected = array(
-            new Reference('my_cache_warmer_service2'),
-            new Reference('my_cache_warmer_service1'),
-            new Reference('my_cache_warmer_service3'),
+        $this->assertEquals(
+            array(
+                new Reference('my_cache_warmer_service2'),
+                new Reference('my_cache_warmer_service1'),
+                new Reference('my_cache_warmer_service3'),
+            ),
+            $cacheWarmerDefinition->getArgument(0)
         );
-        $this->assertEquals($expected, $definition->getArgument(0));
     }
 
     public function testThatCompilerPassIsIgnoredIfThereIsNoCacheWarmerDefinition()
     {
-        $definition = $this->getMockBuilder('Symfony\Component\DependencyInjection\Definition')->getMock();
-        $container = $this->getMockBuilder('Symfony\Component\DependencyInjection\ContainerBuilder')->setMethods(array('hasDefinition', 'findTaggedServiceIds', 'getDefinition'))->getMock();
-
-        $container->expects($this->never())->method('findTaggedServiceIds');
-        $container->expects($this->never())->method('getDefinition');
-        $container->expects($this->atLeastOnce())
-            ->method('hasDefinition')
-            ->with('cache_warmer')
-            ->will($this->returnValue(false));
-        $definition->expects($this->never())->method('replaceArgument');
+        $container = new ContainerBuilder();
 
         $addCacheWarmerPass = new AddCacheWarmerPass();
         $addCacheWarmerPass->process($container);
+
+        // we just check that the pass does not break if no cache warmer is registered
+        $this->addToAssertionCount(1);
     }
 
     public function testThatCacheWarmersMightBeNotDefined()
     {
-        $definition = $this->getMockBuilder('Symfony\Component\DependencyInjection\Definition')->getMock();
-        $container = $this->getMockBuilder('Symfony\Component\DependencyInjection\ContainerBuilder')->setMethods(array('hasDefinition', 'findTaggedServiceIds', 'getDefinition'))->getMock();
-
-        $container->expects($this->atLeastOnce())
-            ->method('findTaggedServiceIds')
-            ->will($this->returnValue(array()));
-        $container->expects($this->never())->method('getDefinition');
-        $container->expects($this->atLeastOnce())
-            ->method('hasDefinition')
-            ->with('cache_warmer')
-            ->will($this->returnValue(true));
-
-        $definition->expects($this->never())->method('replaceArgument');
+        $container = new ContainerBuilder();
+        $cacheWarmerDefinition = $container->register('cache_warmer')->addArgument(array());
 
         $addCacheWarmerPass = new AddCacheWarmerPass();
         $addCacheWarmerPass->process($container);
+
+        $this->assertSame(array(), $cacheWarmerDefinition->getArgument(0));
     }
 }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddConstraintValidatorsPassTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddConstraintValidatorsPassTest.php
index d9065e46d5..a5291114dc 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddConstraintValidatorsPassTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddConstraintValidatorsPassTest.php
@@ -66,18 +66,10 @@ class AddConstraintValidatorsPassTest extends TestCase
 
     public function testThatCompilerPassIsIgnoredIfThereIsNoConstraintValidatorFactoryDefinition()
     {
-        $definition = $this->getMockBuilder('Symfony\Component\DependencyInjection\Definition')->getMock();
-        $container = $this->getMockBuilder('Symfony\Component\DependencyInjection\ContainerBuilder')->setMethods(array('hasDefinition', 'findTaggedServiceIds', 'getDefinition'))->getMock();
-
-        $container->expects($this->never())->method('findTaggedServiceIds');
-        $container->expects($this->never())->method('getDefinition');
-        $container->expects($this->atLeastOnce())
-            ->method('hasDefinition')
-            ->with('validator.validator_factory')
-            ->will($this->returnValue(false));
-        $definition->expects($this->never())->method('replaceArgument');
-
         $addConstraintValidatorsPass = new AddConstraintValidatorsPass();
-        $addConstraintValidatorsPass->process($container);
+        $addConstraintValidatorsPass->process(new ContainerBuilder());
+
+        // we just check that the pass does not fail if no constraint validator factory is registered
+        $this->addToAssertionCount(1);
     }
 }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/ProfilerPassTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/ProfilerPassTest.php
index e064ce9f17..9fcae720b2 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/ProfilerPassTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/ProfilerPassTest.php
@@ -12,18 +12,11 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\ProfilerPass;
 
 class ProfilerPassTest extends TestCase
 {
-    private $profilerDefinition;
-
-    protected function setUp()
-    {
-        $this->profilerDefinition = new Definition('ProfilerClass');
-    }
-
     /**
      * Tests that collectors that specify a template but no "id" will throw
      * an exception (both are needed if the template is specified).
@@ -31,17 +24,15 @@ class ProfilerPassTest extends TestCase
      * Thus, a fully-valid tag looks something like this:
      *
      *     <tag name="data_collector" template="YourBundle:Collector:templatename" id="your_collector_name" />
+     *
+     * @expectedException \InvalidArgumentException
      */
     public function testTemplateNoIdThrowsException()
     {
-        // one service, with a template key, but no id
-        $services = array(
-            'my_collector_service' => array(0 => array('template' => 'foo')),
-        );
-
-        $builder = $this->createContainerMock($services);
-
-        $this->{method_exists($this, $_ = 'expectException') ? $_ : 'setExpectedException'}('InvalidArgumentException');
+        $builder = new ContainerBuilder();
+        $builder->register('profiler', 'ProfilerClass');
+        $builder->register('my_collector_service')
+            ->addTag('data_collector', array('template' => 'foo'));
 
         $profilerPass = new ProfilerPass();
         $profilerPass->process($builder);
@@ -49,45 +40,19 @@ class ProfilerPassTest extends TestCase
 
     public function testValidCollector()
     {
-        // one service, with a template key, but no id
-        $services = array(
-            'my_collector_service' => array(0 => array('template' => 'foo', 'id' => 'my_collector')),
-        );
-
-        $container = $this->createContainerMock($services);
-
-        // fake the getDefinition() to return a Profiler definition
-        $container->expects($this->atLeastOnce())
-            ->method('getDefinition');
-
-        // assert that the data_collector.templates parameter should be set
-        $container->expects($this->once())
-            ->method('setParameter')
-            ->with('data_collector.templates', array('my_collector_service' => array('my_collector', 'foo')));
+        $container = new ContainerBuilder();
+        $profilerDefinition = $container->register('profiler', 'ProfilerClass');
+        $container->register('my_collector_service')
+            ->addTag('data_collector', array('template' => 'foo', 'id' => 'my_collector'));
 
         $profilerPass = new ProfilerPass();
         $profilerPass->process($container);
 
+        $this->assertSame(array('my_collector_service' => array('my_collector', 'foo')), $container->getParameter('data_collector.templates'));
+
         // grab the method calls off of the "profiler" definition
-        $methodCalls = $this->profilerDefinition->getMethodCalls();
+        $methodCalls = $profilerDefinition->getMethodCalls();
         $this->assertCount(1, $methodCalls);
         $this->assertEquals('add', $methodCalls[0][0]); // grab the method part of the first call
     }
-
-    private function createContainerMock($services)
-    {
-        $container = $this->getMockBuilder('Symfony\Component\DependencyInjection\ContainerBuilder')->setMethods(array('hasDefinition', 'getDefinition', 'findTaggedServiceIds', 'setParameter'))->getMock();
-        $container->expects($this->any())
-            ->method('hasDefinition')
-            ->with($this->equalTo('profiler'))
-            ->will($this->returnValue(true));
-        $container->expects($this->any())
-            ->method('getDefinition')
-            ->will($this->returnValue($this->profilerDefinition));
-        $container->expects($this->atLeastOnce())
-            ->method('findTaggedServiceIds')
-            ->will($this->returnValue($services));
-
-        return $container;
-    }
 }
diff --git a/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/Compiler/TwigLoaderPassTest.php b/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/Compiler/TwigLoaderPassTest.php
index 6575f28c97..e142d18a84 100644
--- a/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/Compiler/TwigLoaderPassTest.php
+++ b/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/Compiler/TwigLoaderPassTest.php
@@ -13,13 +13,14 @@ namespace Symfony\Bundle\TwigBundle\Tests\DependencyInjection\Compiler;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Alias;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\TwigLoaderPass;
 
 class TwigLoaderPassTest extends TestCase
 {
     /**
-     * @var \PHPUnit_Framework_MockObject_MockObject
+     * @var ContainerBuilder
      */
     private $builder;
     /**
@@ -33,64 +34,33 @@ class TwigLoaderPassTest extends TestCase
 
     protected function setUp()
     {
-        $this->builder = $this->getMockBuilder('Symfony\Component\DependencyInjection\ContainerBuilder')->setMethods(array('hasDefinition', 'findTaggedServiceIds', 'setAlias', 'getDefinition'))->getMock();
+        $this->builder = new ContainerBuilder();
+        $this->builder->register('twig');
         $this->chainLoader = new Definition('loader');
         $this->pass = new TwigLoaderPass();
     }
 
-    public function testMapperPassWithOneTaggedLoaders()
+    public function testMapperPassWithOneTaggedLoader()
     {
-        $serviceIds = array(
-            'test_loader_1' => array(
-                array(),
-            ),
-        );
-
-        $this->builder->expects($this->once())
-            ->method('hasDefinition')
-            ->with('twig')
-            ->will($this->returnValue(true));
-        $this->builder->expects($this->once())
-            ->method('findTaggedServiceIds')
-            ->with('twig.loader')
-            ->will($this->returnValue($serviceIds));
-        $this->builder->expects($this->once())
-            ->method('setAlias')
-            ->with('twig.loader', 'test_loader_1')
-            ->will($this->returnValue(new Alias('test_loader_1')));
+        $this->builder->register('test_loader_1')
+            ->addTag('twig.loader');
 
         $this->pass->process($this->builder);
+
+        $this->assertSame('test_loader_1', (string) $this->builder->getAlias('twig.loader'));
     }
 
     public function testMapperPassWithTwoTaggedLoaders()
     {
-        $serviceIds = array(
-            'test_loader_1' => array(
-                array(),
-            ),
-            'test_loader_2' => array(
-                array(),
-            ),
-        );
-
-        $this->builder->expects($this->once())
-            ->method('hasDefinition')
-            ->with('twig')
-            ->will($this->returnValue(true));
-        $this->builder->expects($this->once())
-            ->method('findTaggedServiceIds')
-            ->with('twig.loader')
-            ->will($this->returnValue($serviceIds));
-        $this->builder->expects($this->once())
-            ->method('getDefinition')
-            ->with('twig.loader.chain')
-            ->will($this->returnValue($this->chainLoader));
-        $this->builder->expects($this->once())
-            ->method('setAlias')
-            ->with('twig.loader', 'twig.loader.chain')
-            ->will($this->returnValue(new Alias('twig.loader.chain')));
+        $this->builder->setDefinition('twig.loader.chain', $this->chainLoader);
+        $this->builder->register('test_loader_1')
+            ->addTag('twig.loader');
+        $this->builder->register('test_loader_2')
+            ->addTag('twig.loader');
 
         $this->pass->process($this->builder);
+
+        $this->assertSame('twig.loader.chain', (string) $this->builder->getAlias('twig.loader'));
         $calls = $this->chainLoader->getMethodCalls();
         $this->assertCount(2, $calls);
         $this->assertEquals('addLoader', $calls[0][0]);
@@ -101,33 +71,15 @@ class TwigLoaderPassTest extends TestCase
 
     public function testMapperPassWithTwoTaggedLoadersWithPriority()
     {
-        $serviceIds = array(
-            'test_loader_1' => array(
-                array('priority' => 100),
-            ),
-            'test_loader_2' => array(
-                array('priority' => 200),
-            ),
-        );
-
-        $this->builder->expects($this->once())
-            ->method('hasDefinition')
-            ->with('twig')
-            ->will($this->returnValue(true));
-        $this->builder->expects($this->once())
-            ->method('findTaggedServiceIds')
-            ->with('twig.loader')
-            ->will($this->returnValue($serviceIds));
-        $this->builder->expects($this->once())
-            ->method('getDefinition')
-            ->with('twig.loader.chain')
-            ->will($this->returnValue($this->chainLoader));
-        $this->builder->expects($this->once())
-            ->method('setAlias')
-            ->with('twig.loader', 'twig.loader.chain')
-            ->will($this->returnValue(new Alias('twig.loader.chain')));
+        $this->builder->setDefinition('twig.loader.chain', $this->chainLoader);
+        $this->builder->register('test_loader_1')
+            ->addTag('twig.loader', array('priority' => 100));
+        $this->builder->register('test_loader_2')
+            ->addTag('twig.loader', array('priority' => 200));
 
         $this->pass->process($this->builder);
+
+        $this->assertSame('twig.loader.chain', (string) $this->builder->getAlias('twig.loader'));
         $calls = $this->chainLoader->getMethodCalls();
         $this->assertCount(2, $calls);
         $this->assertEquals('addLoader', $calls[0][0]);
@@ -141,15 +93,6 @@ class TwigLoaderPassTest extends TestCase
      */
     public function testMapperPassWithZeroTaggedLoaders()
     {
-        $this->builder->expects($this->once())
-            ->method('hasDefinition')
-            ->with('twig')
-            ->will($this->returnValue(true));
-        $this->builder->expects($this->once())
-            ->method('findTaggedServiceIds')
-            ->with('twig.loader')
-            ->will($this->returnValue(array()));
-
         $this->pass->process($this->builder);
     }
 }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Extension/ExtensionTest.php b/src/Symfony/Component/DependencyInjection/Tests/Extension/ExtensionTest.php
index 90852c359e..9f66bfd7c6 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Extension/ExtensionTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Extension/ExtensionTest.php
@@ -12,6 +12,8 @@
 namespace Symfony\Component\DependencyInjection\Tests\Extension;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 
 class ExtensionTest extends TestCase
 {
@@ -20,36 +22,8 @@ class ExtensionTest extends TestCase
      */
     public function testIsConfigEnabledReturnsTheResolvedValue($enabled)
     {
-        $pb = $this->getMockBuilder('Symfony\Component\DependencyInjection\ParameterBag\ParameterBag')
-            ->setMethods(array('resolveValue'))
-            ->getMock()
-        ;
-
-        $container = $this->getMockBuilder('Symfony\Component\DependencyInjection\ContainerBuilder')
-            ->setMethods(array('getParameterBag'))
-            ->getMock()
-        ;
-
-        $pb->expects($this->once())
-            ->method('resolveValue')
-            ->with($this->equalTo($enabled))
-            ->will($this->returnValue($enabled))
-        ;
-
-        $container->expects($this->once())
-            ->method('getParameterBag')
-            ->will($this->returnValue($pb))
-        ;
-
-        $extension = $this->getMockBuilder('Symfony\Component\DependencyInjection\Extension\Extension')
-            ->setMethods(array())
-            ->getMockForAbstractClass()
-        ;
-
-        $r = new \ReflectionMethod('Symfony\Component\DependencyInjection\Extension\Extension', 'isConfigEnabled');
-        $r->setAccessible(true);
-
-        $r->invoke($extension, $container, array('enabled' => $enabled));
+        $extension = new EnableableExtension();
+        $this->assertSame($enabled, $extension->isConfigEnabled(new ContainerBuilder(), array('enabled' => $enabled)));
     }
 
     public function getResolvedEnabledFixtures()
@@ -66,18 +40,20 @@ class ExtensionTest extends TestCase
      */
     public function testIsConfigEnabledOnNonEnableableConfig()
     {
-        $container = $this->getMockBuilder('Symfony\Component\DependencyInjection\ContainerBuilder')
-            ->getMock()
-        ;
+        $extension = new EnableableExtension();
 
-        $extension = $this->getMockBuilder('Symfony\Component\DependencyInjection\Extension\Extension')
-            ->setMethods(array())
-            ->getMockForAbstractClass()
-        ;
-
-        $r = new \ReflectionMethod('Symfony\Component\DependencyInjection\Extension\Extension', 'isConfigEnabled');
-        $r->setAccessible(true);
-
-        $r->invoke($extension, $container, array());
+        $extension->isConfigEnabled(new ContainerBuilder(), array());
+    }
+}
+
+class EnableableExtension extends Extension
+{
+    public function load(array $configs, ContainerBuilder $container)
+    {
+    }
+
+    public function isConfigEnabled(ContainerBuilder $container, array $config)
+    {
+        return parent::isConfigEnabled($container, $config);
     }
 }
diff --git a/src/Symfony/Component/Finder/Finder.php b/src/Symfony/Component/Finder/Finder.php
index 07dce771b4..8e33d4118b 100644
--- a/src/Symfony/Component/Finder/Finder.php
+++ b/src/Symfony/Component/Finder/Finder.php
@@ -313,6 +313,8 @@ class Finder implements \IteratorAggregate, \Countable
     /**
      * Excludes "hidden" directories and files (starting with a dot).
      *
+     * This option is enabled by default.
+     *
      * @param bool $ignoreDotFiles Whether to exclude "hidden" files or not
      *
      * @return $this
@@ -333,6 +335,8 @@ class Finder implements \IteratorAggregate, \Countable
     /**
      * Forces the finder to ignore version control directories.
      *
+     * This option is enabled by default.
+     *
      * @param bool $ignoreVCS Whether to exclude VCS files or not
      *
      * @return $this
diff --git a/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/MergeExtensionConfigurationPassTest.php b/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/MergeExtensionConfigurationPassTest.php
index 81fc8b455d..ae421d919b 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/MergeExtensionConfigurationPassTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/MergeExtensionConfigurationPassTest.php
@@ -12,44 +12,39 @@
 namespace Symfony\Component\HttpKernel\Tests\DependencyInjection;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Symfony\Component\HttpKernel\DependencyInjection\MergeExtensionConfigurationPass;
 
 class MergeExtensionConfigurationPassTest extends TestCase
 {
     public function testAutoloadMainExtension()
     {
-        $container = $this->getMockBuilder('Symfony\\Component\\DependencyInjection\\ContainerBuilder')->setMethods(array('getExtensionConfig', 'loadFromExtension', 'getParameterBag', 'getDefinitions', 'getAliases', 'getExtensions'))->getMock();
-        $params = $this->getMockBuilder('Symfony\\Component\\DependencyInjection\\ParameterBag\\ParameterBag')->getMock();
+        $container = new ContainerBuilder();
+        $container->registerExtension(new LoadedExtension());
+        $container->registerExtension(new NotLoadedExtension());
+        $container->loadFromExtension('loaded', array());
 
-        $container->expects($this->at(0))
-            ->method('getExtensionConfig')
-            ->with('loaded')
-            ->will($this->returnValue(array(array())));
-        $container->expects($this->at(1))
-            ->method('getExtensionConfig')
-            ->with('notloaded')
-            ->will($this->returnValue(array()));
-        $container->expects($this->once())
-            ->method('loadFromExtension')
-            ->with('notloaded', array());
-
-        $container->expects($this->any())
-            ->method('getParameterBag')
-            ->will($this->returnValue($params));
-        $params->expects($this->any())
-            ->method('all')
-            ->will($this->returnValue(array()));
-        $container->expects($this->any())
-            ->method('getDefinitions')
-            ->will($this->returnValue(array()));
-        $container->expects($this->any())
-            ->method('getAliases')
-            ->will($this->returnValue(array()));
-        $container->expects($this->any())
-            ->method('getExtensions')
-            ->will($this->returnValue(array()));
-
-        $configPass = new MergeExtensionConfigurationPass(array('loaded', 'notloaded'));
+        $configPass = new MergeExtensionConfigurationPass(array('loaded', 'not_loaded'));
         $configPass->process($container);
+
+        $this->assertTrue($container->hasDefinition('loaded.foo'));
+        $this->assertTrue($container->hasDefinition('not_loaded.bar'));
+    }
+}
+
+class LoadedExtension extends Extension
+{
+    public function load(array $configs, ContainerBuilder $container)
+    {
+        $container->register('loaded.foo');
+    }
+}
+
+class NotLoadedExtension extends Extension
+{
+    public function load(array $configs, ContainerBuilder $container)
+    {
+        $container->register('not_loaded.bar');
     }
 }