Function $httpBackend

test/angular/1.4/angular-mocks.js:1251–1325

(method, url, data, callback, headers, timeout, withCredentials, responseType)

  // TODO(vojta): change params to: method, url, data, headers, callback
  function $httpBackend(method, url, data, callback, headers, timeout, withCredentials, responseType) {

    var xhr = new MockXhr(),
        expectation = expectations[0],
        wasExpected = false;

    function prettyPrint(data) {
      return (angular.isString(data) || angular.isFunction(data) || data instanceof RegExp)
          ? data
          : angular.toJson(data);
    }

    function wrapResponse(wrapped) {
      if (!$browser && timeout) {
        timeout.then ? timeout.then(handleTimeout) : $timeout(handleTimeout, timeout);
      }

      return handleResponse;

      function handleResponse() {
        var response = wrapped.response(method, url, data, headers);
        xhr.$$respHeaders = response[2];
        callback(copy(response[0]), copy(response[1]), xhr.getAllResponseHeaders(),
                 copy(response[3] || ''));
      }

      function handleTimeout() {
        for (var i = 0, ii = responses.length; i < ii; i++) {
          if (responses[i] === handleResponse) {
            responses.splice(i, 1);
            callback(-1, undefined, '');
            break;
          }
        }
      }
    }

    if (expectation && expectation.match(method, url)) {
      if (!expectation.matchData(data)) {
        throw new Error('Expected ' + expectation + ' with different data\n' +
            'EXPECTED: ' + prettyPrint(expectation.data) + '\nGOT:      ' + data);
      }

      if (!expectation.matchHeaders(headers)) {
        throw new Error('Expected ' + expectation + ' with different headers\n' +
                        'EXPECTED: ' + prettyPrint(expectation.headers) + '\nGOT:      ' +
                        prettyPrint(headers));
      }

      expectations.shift();

      if (expectation.response) {
        responses.push(wrapResponse(expectation));
        return;
      }
      wasExpected = true;
    }