Mock.php

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<?php
require_once 'HTTP/Request2/Adapter.php';

class HTTP_Request2_Adapter_Mock extends HTTP_Request2_Adapter
{
    protected $responses = array();

    public function sendRequest(HTTP_Request2 $request)
    {
        $requestUrl = (string)$request->getUrl();
        $response   = null;
        foreach ($this->responses as $k => $v) {
            if (!$v[1] || $requestUrl == $v[1]) {
                $response = $v[0];
                array_splice($this->responses, $k, 1);
                break;
            }
        }
        if (!$response) {
            return self::createResponseFromString("HTTP/1.1 400 Bad Request\r\n\r\n");

        } elseif ($response instanceof HTTP_Request2_Response) {
            return $response;

        } else {
            // rethrow the exception
            $class   = get_class($response);
            $message = $response->getMessage();
            $code    = $response->getCode();
            throw new $class($message, $code);
        }
    }

    public function addResponse($response, $url = null)
    {
        if (is_string($response)) {
            $response = self::createResponseFromString($response);
        } elseif (is_resource($response)) {
            $response = self::createResponseFromFile($response);
        } elseif (!$response instanceof HTTP_Request2_Response &&
                  !$response instanceof Exception
        ) {
            throw new HTTP_Request2_Exception('Parameter is not a valid response');
        }
        $this->responses[] = array($response, $url);
    }

    public static function createResponseFromString($str)
    {
        $parts       = preg_split('!(\r?\n){2}!m', $str, 2);
        $headerLines = explode("\n", $parts[0]);
        $response    = new HTTP_Request2_Response(array_shift($headerLines));
        foreach ($headerLines as $headerLine) {
            $response->parseHeaderLine($headerLine);
        }
        $response->parseHeaderLine('');
        if (isset($parts[1])) {
            $response->appendBody($parts[1]);
        }
        return $response;
    }

    public static function createResponseFromFile($fp)
    {
        $response = new HTTP_Request2_Response(fgets($fp));
        do {
            $headerLine = fgets($fp);
            $response->parseHeaderLine($headerLine);
        } while ('' != trim($headerLine));

        while (!feof($fp)) {
            $response->appendBody(fread($fp, 8192));
        }
        return $response;
    }
}
?>