minor symfony#26113 [SecurityBundle] Backport test (chalasr)

This PR was merged into the 2.7 branch.

Discussion
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[SecurityBundle] Backport test

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

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Commits
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d195a6f [SecurityBundle] Backport test

Author: chalasr

src/Symfony/Component/Security/Http/Tests/Firewall/UsernamePasswordFormAuthenticationListenerTest.php

@@ -77,14 +77,14 @@ public function testHandleWhenUsernameLength($username, $ok)
     }
 
     /**
+     * @dataProvider postOnlyDataProvider
      * @expectedException \Symfony\Component\HttpKernel\Exception\BadRequestHttpException
      * @expectedExceptionMessage The key "_username" must be a string, "array" given.
      */
-    public function testHandleNonStringUsername()
+    public function testHandleNonStringUsername($postOnly)
     {
         $request = Request::create('/login_check', 'POST', array('_username' => array()));
         $request->setSession($this->getMockBuilder('Symfony\Component\HttpFoundation\Session\SessionInterface')->getMock());
-
         $listener = new UsernamePasswordFormAuthenticationListener(
             new TokenStorage(),
             $this->getMockBuilder('Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface')->getMock(),
@@ -93,14 +93,20 @@ public function testHandleNonStringUsername()
             'foo',
             new DefaultAuthenticationSuccessHandler($httpUtils),
             new DefaultAuthenticationFailureHandler($this->getMockBuilder('Symfony\Component\HttpKernel\HttpKernelInterface')->getMock(), $httpUtils),
-            array('require_previous_session' => false)
+            array('require_previous_session' => false, 'post_only' => $postOnly)
         );
-
         $event = new GetResponseEvent($this->getMockBuilder('Symfony\Component\HttpKernel\HttpKernelInterface')->getMock(), $request, HttpKernelInterface::MASTER_REQUEST);
-
         $listener->handle($event);
     }
 
+    public function postOnlyDataProvider()
+    {
+        return array(
+            array(true),
+            array(false),
+        );
+    }
+
     public function getUsernameForLength()
     {
         return array(