[Security] Added a test to the BasicAuthenticationListener.

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

@@ -195,4 +195,18 @@ class BasicAuthenticationListenerTest extends \PHPUnit_Framework_TestCase
 
         $listener->handle($event);
     }
+
+    /**
+     * @expectedException \InvalidArgumentException
+     * @expectedExceptionMessage $providerKey must not be empty
+     */
+    public function testItRequiresProviderKey()
+    {
+        new BasicAuthenticationListener(
+            $this->getMock('Symfony\Component\Security\Core\SecurityContextInterface'),
+            $this->getMock('Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface'),
+            '',
+            $this->getMock('Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface')
+        );
+    }
 }