minor #21663 Updated PHPUnit namespaces (peterrehm)

This PR was squashed before being merged into the 2.8 branch (closes #21663).

Discussion
----------

Updated PHPUnit namespaces

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Follow Up of #21564

Commits
-------

205ced4 Updated PHPUnit namespaces

Author: nicolas-grekas

Tests/DependencyInjection/Compiler/ConfigCachePassTest.php

@@ -11,10 +11,11 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\ConfigCachePass;
 
-class ConfigCachePassTest extends \PHPUnit_Framework_TestCase
+class ConfigCachePassTest extends TestCase
 {
     public function testThatCheckersAreProcessedInPriorityOrder()
     {

Tests/DependencyInjection/Compiler/DataCollectorTranslatorPassTest.php

@@ -11,12 +11,13 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\DataCollectorTranslatorPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\Translation\TranslatorInterface;
 
-class DataCollectorTranslatorPassTest extends \PHPUnit_Framework_TestCase
+class DataCollectorTranslatorPassTest extends TestCase
 {
     private $container;
     private $dataCollectorTranslatorPass;

Tests/DependencyInjection/Compiler/FormPassTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\FormPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
@@ -20,7 +21,7 @@
 /**
  * @author Bernhard Schussek <[email protected]>
  */
-class FormPassTest extends \PHPUnit_Framework_TestCase
+class FormPassTest extends TestCase
 {
     public function testDoNothingIfFormExtensionNotLoaded()
     {

Tests/DependencyInjection/Compiler/PropertyInfoPassTest.php

@@ -11,10 +11,11 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\PropertyInfoPass;
 use Symfony\Component\DependencyInjection\Reference;
 
-class PropertyInfoPassTest extends \PHPUnit_Framework_TestCase
+class PropertyInfoPassTest extends TestCase
 {
     public function testServicesAreOrderedAccordingToPriority()
     {

Tests/DependencyInjection/Compiler/UnusedTagsPassTest.php

@@ -11,9 +11,10 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\UnusedTagsPass;
 
-class UnusedTagsPassTest extends \PHPUnit_Framework_TestCase
+class UnusedTagsPassTest extends TestCase
 {
     public function testProcess()
     {

Tests/Kernel/MicroKernelTraitTest.php

@@ -11,9 +11,10 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Kernel;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
 
-class MicroKernelTraitTest extends \PHPUnit_Framework_TestCase
+class MicroKernelTraitTest extends TestCase
 {
     /**
      * @requires PHP 5.4

Tests/Routing/DelegatingLoaderTest.php

@@ -2,12 +2,13 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Routing;
 
+use PHPUnit\Framework\TestCase;
 use Psr\Log\NullLogger;
 use Symfony\Bundle\FrameworkBundle\Controller\ControllerNameParser;
 use Symfony\Bundle\FrameworkBundle\Routing\DelegatingLoader;
 use Symfony\Component\Config\Loader\LoaderResolver;
 
-class DelegatingLoaderTest extends \PHPUnit_Framework_TestCase
+class DelegatingLoaderTest extends TestCase
 {
     /** @var ControllerNameParser */
     private $controllerNameParser;