minor #641 Using the new PHPUnit namespace (yceruto)

This PR was merged into the master branch.

Discussion
----------

Using the new PHPUnit namespace

Moving on to the most recent updates.

Commits
-------

df6aa1c Using the new PHPUnit namespace

tests/Form/DataTransformer/TagArrayToStringTransformerTest.php

@@ -15,13 +15,14 @@
 use App\Form\DataTransformer\TagArrayToStringTransformer;
 use Doctrine\Common\Persistence\ObjectManager;
 use Doctrine\ORM\EntityRepository;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Tests that tags are transformed correctly using the data transformer.
  *
  * See https://symfony.com/doc/current/testing/database.html
  */
-class TagArrayToStringTransformerTest extends \PHPUnit\Framework\TestCase
+class TagArrayToStringTransformerTest extends TestCase
 {
     /**
      * Ensures that tags are created correctly.

tests/Utils/SluggerTest.php

@@ -12,6 +12,7 @@
 namespace App\Tests\Utils;
 
 use App\Utils\Slugger;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Unit test for the application utils.
@@ -23,7 +24,7 @@
  *     $ cd your-symfony-project/
  *     $ ./vendor/bin/phpunit
  */
-class SluggerTest extends \PHPUnit_Framework_TestCase
+class SluggerTest extends TestCase
 {
     /**
      * @dataProvider getSlugs

tests/Utils/ValidatorTest.php

@@ -12,8 +12,9 @@
 namespace App\Tests\Utils;
 
 use App\Utils\Validator;
+use PHPUnit\Framework\TestCase;
 
-class ValidatorTest extends \PHPUnit_Framework_TestCase
+class ValidatorTest extends TestCase
 {
     private $object;