Angular 单元测试承诺

Question

我对 Promise 不熟悉，并且似乎可以运行实际代码，但也尝试编写单元测试...

这是我的控制器：

appModule.controller('MyController', function($scope, myService, $timeout, mySecondService) {

    $scope.accept = false;
    $scope.loading = false;
    $scope.text = 'Some text';

    $scope.testCall = function() {

        $scope.person = true;
        $scope.text = '';
        $scope.loading = true;

        myService.getWeather()            
            .then(function(data) {
                if (data.valid===true) {
                    $timeout(function(){
                        $scope.loading = false;
                        $scope.accept = true;

                        $timeout(function(){
                            $scope.customer.cart = false;
                        }, 1400);

                    }, 1500);
                }
                else {
                    $scope.person = false;
                    $scope.newMessage = mySecondService.getItem();
                }
            }, function(error) {
                $scope.person = false;
                $scope.newMessage = mySecondService.getItem();
            });
    }
});

控制器规格：

beforeEach(module('myApp'));

describe("MyController Tests", function() {

    var scope;
    var ctrl;

    var customerInfo = {           
            "ID" : "212143513",
            "firstName" : "Lewis",
            "lastName" : "Noel"
    };

    beforeEach(inject(function($rootScope, $controller, myService) {
        scope = $rootScope.$new();
        rootScope = $rootScope;        

        mockMyService = myService;      

        ctrl = $controller('MyController', {$scope:scope, myService:mockMyService});

        spyOn(scope, 'testCall').and.callThrough();
    }));

    it("On controller load, initialise variables", function() {
        expect(scope.text).toEqual('Some text');
        expect(scope.loading).toEqual(false);
        expect(scope.accept).toEqual(false);
    });
});

以上测试了 $scope 的初始化，但服务中没有任何内容...

这是我的服务：

appModule.factory('myService', function ($http, $q) {
return {
        getWeather: function() {
            return $http.get('/cart/customerCart/546546')
                .then(function(response) {
                    if (typeof response.data === 'object') {
                        return response.data;
                    }
                    else {
                        // invalid response
                        return $q.reject(response.data);
                    }

                }, function(response) {
                    // something went wrong
                    return $q.reject(response.data);
                });
        }
    };
});

Answer 1

如果您询问如何测试服务，我会这样做：

describe("myService", function() {
  var myService;
  beforeEach(inject(function($rootScope, _myService_) {
    myService = _myService_;
  }));

  it("On controller load, initialise variables", function() {
    var result;
    myService.getWeather().then( function (data) {
      result = data;
    });
    $rootScope.$apply();
    expect(result).toEqual(whatever);
  });
});

注意事项：

• 您可以使用 _myService_ 下划线技巧来获取服务 myService，而无需创建具有该名称 (see docs) 的局部变量。
• 您需要调用 $rootScope.$apply() 来刷新测试中的承诺。 see docs

编辑： 你错误地使用了承诺，我会重构你的工厂（未经测试）：

appModule.factory('myService', function ($http, $q) {
  return {
    getWeather: function() {
      var defer = $q.defer();
      $http.get('/cart/customerCart/546546')
         .then(function(response) {
            if (typeof response.data === 'object') {
               defer.resolve(response.data);
            }
            else {
               // invalid response
               defer.reject(response.data);
            }
          }, function(response) {
            // something went wrong
            defer.reject(response.data);
          });
      return defer.promise;
    }
  };
});