Added tests to cover the possibility of having scalars as services.

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

@@ -38,6 +38,7 @@ use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ServiceLocator;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\CaseSensitiveClass;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\ScalarFactory;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\SimilarArgumentsDummy;
 use Symfony\Component\DependencyInjection\TypedReference;
 use Symfony\Component\ExpressionLanguage\Expression;
@@ -1532,6 +1533,20 @@ class ContainerBuilderTest extends TestCase
 
         $this->assertSame(['service_container'], array_keys($container->getDefinitions()));
     }
+
+    public function testScalarService()
+    {
+        $c = new ContainerBuilder();
+        $c->register('foo', 'string')
+            ->setPublic(true)
+            ->setFactory([ScalarFactory::class, 'getSomeValue'])
+        ;
+
+        $c->compile();
+
+        $this->assertTrue($c->has('foo'));
+        $this->assertSame('some value', $c->get('foo'));
+    }
 }
 
 class FooClass

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

@@ -386,6 +386,16 @@ class ContainerTest extends TestCase
         $this->assertTrue($sc->has('foo\\baz'), '->has() returns true if a get*Method() is defined');
     }
 
+    public function testScalarService()
+    {
+        $c = new Container();
+
+        $c->set('foo', 'some value');
+
+        $this->assertTrue($c->has('foo'));
+        $this->assertSame('some value', $c->get('foo'));
+    }
+
     public function testInitialized()
     {
         $sc = new ProjectServiceContainer();

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

@@ -30,6 +30,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ServiceLocator;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\ScalarFactory;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\StubbedTranslator;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber;
 use Symfony\Component\DependencyInjection\TypedReference;
@@ -1115,6 +1116,25 @@ class PhpDumperTest extends TestCase
 
         $this->assertEquals((object) ['foo' => (object) []], $container->get('Bar'));
     }
+
+    public function testScalarService()
+    {
+        $container = new ContainerBuilder();
+        $container->register('foo', 'string')
+            ->setPublic(true)
+            ->setFactory([ScalarFactory::class, 'getSomeValue'])
+        ;
+
+        $container->compile();
+
+        $dumper = new PhpDumper($container);
+        eval('?>'.$dumper->dump(['class' => 'Symfony_DI_PhpDumper_Test_Scalar_Service']));
+
+        $container = new \Symfony_DI_PhpDumper_Test_Scalar_Service();
+
+        $this->assertTrue($container->has('foo'));
+        $this->assertSame('some value', $container->get('foo'));
+    }
 }
 
 class Rot13EnvVarProcessor implements EnvVarProcessorInterface

src/Symfony/Component/DependencyInjection/Tests/Fixtures/ScalarFactory.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures;
+
+final class ScalarFactory
+{
+    /**
+     * @return string
+     */
+    public static function getSomeValue()
+    {
+        return 'some value';
+    }
+}