Fix test.

Author: stevebauman

tests/AdldapTest.php

@@ -133,10 +133,6 @@ public function test_auth_fails_when_user_not_found()
 
     public function test_credentials_key_does_not_exist()
     {
-        $connection = $this->getMockConnection();
-
-        $connection->expects($this->exactly(1))->method('isBound')->willReturn(true);
-
         $this->assertFalse(Auth::attempt(['non-existent-key' => '[email protected]', 'password' => '12345']));
     }