React\HttpClient\Request::handleData PHP Method

    public function handleData($data)
    {
        $this->buffer .= $data;
        if (false !== strpos($this->buffer, "\r\n\r\n")) {
            list($response, $bodyChunk) = $this->parseResponse($this->buffer);
            $this->buffer = null;
            $this->stream->removeListener('drain', array($this, 'handleDrain'));
            $this->stream->removeListener('data', array($this, 'handleData'));
            $this->stream->removeListener('end', array($this, 'handleEnd'));
            $this->stream->removeListener('error', array($this, 'handleError'));
            $this->response = $response;
            $response->on('end', function () {
                $this->close();
            });
            $response->on('error', function (\Exception $error) {
                $this->closeError(new \RuntimeException("An error occured in the response", 0, $error));
            });
            $this->emit('response', array($response, $this));
            $this->stream->emit('data', array($bodyChunk));
        }
    }

 /** @test */
 public function multivalueHeader()
 {
     $requestData = new RequestData('GET', 'http://www.example.com');
     $request = new Request($this->connector, $requestData);
     $this->successfulConnectionMock();
     $response = $this->response;
     $response->expects($this->at(0))->method('on')->with('end', $this->anything());
     $response->expects($this->at(1))->method('on')->with('error', $this->anything())->will($this->returnCallback(function ($event, $cb) use(&$errorCallback) {
         $errorCallback = $cb;
     }));
     $factory = $this->createCallableMock();
     $factory->expects($this->once())->method('__invoke')->with('HTTP', '1.0', '200', 'OK', array('Content-Type' => 'text/plain', 'X-Xss-Protection' => '1; mode=block', 'Cache-Control' => 'public, must-revalidate, max-age=0'))->will($this->returnValue($response));
     $request->setResponseFactory($factory);
     $request->end();
     $request->handleData("HTTP/1.0 200 OK\r\n");
     $request->handleData("Content-Type: text/plain\r\n");
     $request->handleData("X-Xss-Protection:1; mode=block\r\n");
     $request->handleData("Cache-Control:public, must-revalidate, max-age=0\r\n");
     $request->handleData("\r\nbody");
     $this->assertNotNull($errorCallback);
     call_user_func($errorCallback, new \Exception('test'));
 }