SparkPost\SparkPostResponse::getHeaderLine PHP Метод

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

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