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

Core/Tests/Authentication/Provider/LdapBindAuthenticationProviderTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Security\Core\Tests\Authentication\Provider;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\Security\Core\Authentication\Provider\LdapBindAuthenticationProvider;
 use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
 use Symfony\Component\Security\Core\User\User;
@@ -19,7 +20,7 @@
 /**
  * @requires extension ldap
  */
-class LdapBindAuthenticationProviderTest extends \PHPUnit_Framework_TestCase
+class LdapBindAuthenticationProviderTest extends TestCase
 {
     /**
      * @expectedException        \Symfony\Component\Security\Core\Exception\BadCredentialsException

Core/Tests/Authorization/Voter/VoterTest.php

@@ -11,11 +11,12 @@
 
 namespace Symfony\Component\Security\Core\Tests\Authorization\Voter;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Authorization\Voter\Voter;
 use Symfony\Component\Security\Core\Authorization\Voter\VoterInterface;
 
-class VoterTest extends \PHPUnit_Framework_TestCase
+class VoterTest extends TestCase
 {
     protected $token;
 

Core/Tests/Exception/CustomUserMessageAuthenticationExceptionTest.php

@@ -11,9 +11,10 @@
 
 namespace Symfony\Component\Security\Core\Tests\Exception;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\Security\Core\Exception\CustomUserMessageAuthenticationException;
 
-class CustomUserMessageAuthenticationExceptionTest extends \PHPUnit_Framework_TestCase
+class CustomUserMessageAuthenticationExceptionTest extends TestCase
 {
     public function testConstructWithSAfeMessage()
     {

Core/Tests/User/LdapUserProviderTest.php

@@ -11,13 +11,14 @@
 
 namespace Symfony\Component\Security\Core\Tests\User;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\Security\Core\User\LdapUserProvider;
 use Symfony\Component\Ldap\Exception\ConnectionException;
 
 /**
  * @requires extension ldap
  */
-class LdapUserProviderTest extends \PHPUnit_Framework_TestCase
+class LdapUserProviderTest extends TestCase
 {
     /**
      * @expectedException \Symfony\Component\Security\Core\Exception\UsernameNotFoundException

Guard/Tests/Authenticator/FormLoginAuthenticatorTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Security\Guard\Tests\Authenticator;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\User\UserInterface;
@@ -20,7 +21,7 @@
 /**
  * @author Jean Pasdeloup <[email protected]>
  */
-class FormLoginAuthenticatorTest extends \PHPUnit_Framework_TestCase
+class FormLoginAuthenticatorTest extends TestCase
 {
     private $requestWithoutSession;
     private $requestWithSession;

Guard/Tests/Firewall/GuardAuthenticationListenerTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Security\Guard\Tests\Firewall;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Security\Guard\Firewall\GuardAuthenticationListener;
@@ -20,7 +21,7 @@
 /**
  * @author Ryan Weaver <[email protected]>
  */
-class GuardAuthenticationListenerTest extends \PHPUnit_Framework_TestCase
+class GuardAuthenticationListenerTest extends TestCase
 {
     private $authenticationManager;
     private $guardAuthenticatorHandler;

Guard/Tests/GuardAuthenticatorHandlerTest.php

@@ -11,14 +11,15 @@
 
 namespace Symfony\Component\Security\Guard\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Security\Guard\GuardAuthenticatorHandler;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
 use Symfony\Component\Security\Http\SecurityEvents;
 
-class GuardAuthenticatorHandlerTest extends \PHPUnit_Framework_TestCase
+class GuardAuthenticatorHandlerTest extends TestCase
 {
     private $tokenStorage;
     private $dispatcher;

Guard/Tests/Provider/GuardAuthenticationProviderTest.php

@@ -11,13 +11,14 @@
 
 namespace Symfony\Component\Security\Guard\Tests\Provider;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\Security\Guard\Provider\GuardAuthenticationProvider;
 use Symfony\Component\Security\Guard\Token\PostAuthenticationGuardToken;
 
 /**
  * @author Ryan Weaver <[email protected]>
  */
-class GuardAuthenticationProviderTest extends \PHPUnit_Framework_TestCase
+class GuardAuthenticationProviderTest extends TestCase
 {
     private $userProvider;
     private $userChecker;

Http/Tests/Firewall/DigestAuthenticationListenerTest.php

@@ -2,12 +2,13 @@
 
 namespace Symfony\Component\Security\Http\Tests\Firewall;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
 use Symfony\Component\Security\Http\EntryPoint\DigestAuthenticationEntryPoint;
 use Symfony\Component\Security\Http\Firewall\DigestAuthenticationListener;
 
-class DigestAuthenticationListenerTest extends \PHPUnit_Framework_TestCase
+class DigestAuthenticationListenerTest extends TestCase
 {
     public function testHandleWithValidDigest()
     {