diff --git a/src/Symfony/Bundle/DoctrineBundle/Tests/Command/InfoDoctrineCommandTest.php b/src/Symfony/Bundle/DoctrineBundle/Tests/Command/InfoDoctrineCommandTest.php
index 865de2f72c..b264751949 100644
--- a/src/Symfony/Bundle/DoctrineBundle/Tests/Command/InfoDoctrineCommandTest.php
+++ b/src/Symfony/Bundle/DoctrineBundle/Tests/Command/InfoDoctrineCommandTest.php
@@ -22,14 +22,14 @@ class InfoDoctrineCommandTest extends TestCase
 {
     public function testAnnotationsBundle()
     {
-        $input = new StringInput("doctrine:mapping:info");
+        $input = new StringInput('doctrine:mapping:info');
         $output = $this->getMock('Symfony\Component\Console\Output\OutputInterface');
         $output->expects($this->at(0))
                ->method('writeln')
-               ->with($this->equalTo("Found <info>1</info> entities mapped in entity manager <info>default</info>:"));
+               ->with($this->equalTo('Found <info>1</info> entities mapped in entity manager <info>default</info>:'));
         $output->expects($this->at(1))
                ->method('writeln')
-               ->with($this->equalTo("<info>[OK]</info>   Fixtures\Bundles\YamlBundle\Entity\Test"));
+               ->with($this->equalTo('<info>[OK]</info>   Fixtures\Bundles\YamlBundle\Entity\Test'));
 
         $testContainer = $this->createYamlBundleTestContainer();
         $kernel = $this->getMock('Symfony\Component\HttpKernel\Kernel', array(), array(), '', false);
diff --git a/src/Symfony/Bundle/DoctrineBundle/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php b/src/Symfony/Bundle/DoctrineBundle/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php
index 593f62b147..a01d99a880 100755
--- a/src/Symfony/Bundle/DoctrineBundle/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php
+++ b/src/Symfony/Bundle/DoctrineBundle/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php
@@ -689,7 +689,7 @@ abstract class AbstractDoctrineExtensionTest extends TestCase
             'kernel.debug'       => false,
             'kernel.bundles'     => $map,
             'kernel.cache_dir'   => sys_get_temp_dir(),
-            'kernel.root_dir'    => __DIR__ . "/../../../../../" // src dir
+            'kernel.root_dir'    => __DIR__ . '/../../../../../' // src dir
         )));
     }
 
@@ -701,7 +701,7 @@ abstract class AbstractDoctrineExtensionTest extends TestCase
      */
     protected function assertDICDefinitionClass($definition, $expectedClass)
     {
-        $this->assertEquals($expectedClass, $definition->getClass(), "Expected Class of the DIC Container Service Definition is wrong.");
+        $this->assertEquals($expectedClass, $definition->getClass(), 'Expected Class of the DIC Container Service Definition is wrong.');
     }
 
     protected function assertDICConstructorArguments($definition, $args)
diff --git a/src/Symfony/Bundle/DoctrineBundle/Tests/TestCase.php b/src/Symfony/Bundle/DoctrineBundle/Tests/TestCase.php
index 9776577d0b..969fa05024 100644
--- a/src/Symfony/Bundle/DoctrineBundle/Tests/TestCase.php
+++ b/src/Symfony/Bundle/DoctrineBundle/Tests/TestCase.php
@@ -35,7 +35,7 @@ class TestCase extends \PHPUnit_Framework_TestCase
             'kernel.debug'       => false,
             'kernel.bundles'     => array('YamlBundle' => 'Fixtures\Bundles\YamlBundle\YamlBundle'),
             'kernel.cache_dir'   => sys_get_temp_dir(),
-            'kernel.root_dir'    => __DIR__ . "/../../../../" // src dir
+            'kernel.root_dir'    => __DIR__ . '/../../../../' // src dir
         )));
         $container->set('annotation_reader', new AnnotationReader());
         $loader = new DoctrineExtension();
@@ -59,7 +59,7 @@ class TestCase extends \PHPUnit_Framework_TestCase
                     'default' => array(
                     'mappings' => array('YamlBundle' => array(
                         'type' => 'yml',
-                        'dir' => __DIR__ . "/DependencyInjection/Fixtures/Bundles/YamlBundle/Resources/config/doctrine",
+                        'dir' => __DIR__ . '/DependencyInjection/Fixtures/Bundles/YamlBundle/Resources/config/doctrine',
                         'prefix' => 'Fixtures\Bundles\YamlBundle\Entity',
                     )
                 )