使用$ httpBackend对AngularJS控制器进行单元测试

Question

对于我的生活，我无法获得$ httpBackend来处理执行$ http get请求的控制器。我已经试了几个小时了=）

我把它减少到下面最简单的形式。如果我

，测试通过

• 注释掉控制器中的$ http.get（）请求
• 在测试中注释掉“httpMock.flush（）”
• 并更改“pig”和“dog”以匹配

也就是说，它是一个有效的，有效的测试和应用程序。

如果我把它重新插入，我会在底部显示错误。

---

应用程序/ JS / app.js

// Declare a module which depends on filters and services.
var myApp = angular
  .module('myApp', ['ngRoute', 'myApp.filters', 'myApp.services',
                              'myApp.directives'])
  .config(['$routeProvider' , function($routeProvider) {

    $routeProvider
      .when("/dashboard", {
        templateUrl: "partials/dashboard.html",
        controller: cDashboard
      })

      .otherwise({redirectTo: "/dashboard"});
  }]);

// Pre-define our main namespace modules.
angular.module('myApp.directives' , []);
angular.module('myApp.filters'    , []);
angular.module('myApp.services'   , []);
angular.module('myApp.controllers', []);

应用程序/ JS / controller.js

function cDashboard ($scope, $http) {
  $scope.data = "dog";

  // Fetch the actual data.
  $http.get("/data")
    .success(function (data) { $scope.data = data })
    .error(function () {});
}

cDashboard.$inject = [ '$scope', '$http' ];

测试/单元/ controllerSpec.js

describe('cDashboard', function(){
  var scope, ctrl, httpMock;

  beforeEach(inject(function ($rootScope, $controller, $http, $httpBackend) {
    scope = $rootScope.$new();
    ctrl = $controller('cDashboard', {$scope: scope});

    httpMock = $httpBackend;
    httpMock.when("GET", "/data").respond("pig");
  }));

  it("should get 'pig' from '/data'", function () {
    httpMock.expectGET("/data").respond("pig");
    expect(scope.data).toBe("pig");
  });

});

这是我在shell中遇到的错误：

INFO [watcher]: Changed file "/home/myApp/test/unit/controller/cDashboard.js".
Chrome 26.0 (Linux) cDashboard should get 'pig' from '/data' FAILED
    Error: No pending request to flush !
        at Error (<anonymous>)
        at Function.$httpBackend.flush (/home/myApp/test/lib/angular/angular-mocks.js:1171:34)
        at null.<anonymous> (/home/myApp/test/unit/controller/cDashboard.js:15:18)
Chrome 26.0 (Linux): Executed 1 of 1 (1 FAILED) (0.326 secs / 0.008 secs)

Answer 1

您的测试代码中存在一些问题：

1. 在 httpMock配置为使用pig进行响应之前，创建控制器。 expectGet调用应该在实例化控制器之前发生。
2. httpMock需要刷新请求
3. 只要您拥有httMock.when
，就不需要expectGet

工作示例：http://plnkr.co/edit/lUkDMrsy1KJNai3ndtng?p=preview

describe('cDashboard', function(){
  var scope, controllerService, httpMock;

  beforeEach(inject(function ($rootScope, $controller, $httpBackend) {
    scope = $rootScope.$new();
    controllerService = $controller;
    httpMock = $httpBackend;
  }));

  it("should get 'pig' from '/data'", function () {
    httpMock.expectGET("/data").respond("pig");
    ctrl = controllerService('cDashboard', {$scope: scope});
    httpMock.flush();
    expect(scope.data).toBe("pig");
  });
});