SparkPost\SparkPostResponse::getHeader PHP Метод

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

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