SparkPost\SparkPostResponse::getHeaders PHP Метод

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

 public function testGetHeaders()
 {
     $this->responseMock->shouldReceive('getHeaders')->andReturn($this->returnValue);
     $sparkpostResponse = new SparkPostResponse($this->responseMock);
     $this->assertEquals($this->responseMock->getHeaders(), $sparkpostResponse->getHeaders());
 }