承諾不在Jasmine中解決 - AngularJS

Question

我正在嘗試測試一種在用戶確認后從列表中刪除項目的方法。

控制器：

app.controller('mainCtrl', ['$scope', '$window', 'dataService', function($scope, $window, dataService) {
  var vm = this;

  vm.delete = function(id, index) {
    if($window.confirm('Are you sure?')) {
      dataService.deleteById(id).then(function() {
        vm.list.splice(index, 1)
      });
    }
  };
}]);

SEVICE：

app.service('dataService', ['$http', function($http) {
  this.deleteById = function(id) {
    return $http.delete('delete-item?id=' + id);
  };
}]);

測試：

describe('Testing RecipesController', function() {
  var scope, ctrl, dataServiceMock, q, deferred, window;

  beforeEach(function() {
    dataServiceMock = {
      deleteById: function() {
        deferred = q.defer();
        return deferred.promise;
      }
    };
  });

  beforeEach(function() {
    module('app');
    inject(function($rootScope, $controller, $q, $window) {
      q = $q;
      window = $window;
      scope = $rootScope.$new();
      ctrl = $controller('mainCtrl', {
        $scope: scope,
        dataService: dataServiceMock
      });
    });
  });

  it('should delete recipe if the user clicked "OK"', function() {
    spyOn(window, 'confirm').and.returnValue(true);
    spyOn(dataServiceMock, 'deleteById').and.callThrough();

    var item= {
      id: 2,
      name: 'Shirt'
    };

    ctrl.list = ['Hat', 'Shirt'];
    ctrl.delete(item, 1);

    expect(dataServiceMock.deleteById).toHaveBeenCalled();
    expect(ctrl.list.length).toBe(1);
  });
});

我成功地模擬了確認對話框和刪除方法，以及檢查方法是否被調用甚至通過的測試。
但是，promise.then（）無效。
在我運行測試后，我得到了這條消息“預期2為1”。

Answer 1

我確實看到了一件事，那就是你永遠不會在數據服務模擬中解決或拒絕你的承諾。 嘗試將模擬更改為：

beforeEach(function() {
  dataServiceMock = {
    deleteById: function() {
      deferred = q.defer();
      deferred.resolve({ /* whatever data you want to resolve with */ });
      return deferred.promise;
      // You could also shorten this whole mock function to just:
      //    return $q.resolve({ /* some data */ });
    }
  };
});

另外，不要忘記在測試結束時在$rootScope上執行$digest()函數...你實際上是在控制器范圍內執行它，而不是根范圍。

保持實際的$ rootScope對象 - 將您的beforeEach更改為：

var $rScope;

beforeEach(function() {
    module('app');
    inject(function($rootScope, $controller, $q, $window) {
      q = $q;
      window = $window;
      $rScope = $rootScope;
      ctrl = $controller('mainCtrl', {
        $scope: $rootScope.$new(),
        dataService: dataServiceMock
      });
    });
});

然后在測試中，在最后的根作用域上執行$digest ：

it('should delete recipe if the user clicked "OK"', function() {
  // all your test codez...

  $rScope.$digest();
});