Request in PhpUnit using Laravel 5.1

I'm testing my Rest APIs.

I want to pass a parameter to my request.

This is in my controller, I have:

public function index(Request $request)
{
     $abuse = Abuse::where('bombId', $request->input('bombId'))->get();
}

Thing is with PhpUnit, I can never simulate the bombId parameter...

Here is my code:

 $_SERVER['PHP_AUTH_USER'] = 'name@email.com';
 $_SERVER['PHP_AUTH_PW'] = 'xxx';
 $_REQUEST['bombId'] = 25; // I also tried $bombId = 25;
 $this->get('api/v1/abuse', [$_SERVER,$_REQUEST])
           ->seeJson(['total' => 11]);
 $this->assertResponseStatus(200);

Any Idea?