SparkPost\SparkPostResponse::withoutHeader PHP Метод

    public function withoutHeader($name)
    {
        return $this->response->withoutHeader($name);
    }

 public function testWithoutHeader()
 {
     $param = 'header';
     $this->responseMock->shouldReceive('withoutHeader')->andReturn($this->returnValue);
     $sparkpostResponse = new SparkPostResponse($this->responseMock);
     $this->assertEquals($this->responseMock->withoutHeader($param), $sparkpostResponse->withoutHeader($param));
 }