AngularJS:单元测试 Controller 返回 "TypeError: $scope.$watch is not a function"

Question

我想为 Controller 编写一个简单的测试

• sets a variable of the scope to an ID
• calls a function that triggers an API call with the ID on the scope
• log the result

    describe('The app', () => {

      beforeEach(angular.mock.module('myModule'));

      var $controller;
      var eId = 123456;

      beforeEach(angular.mock.inject((_$controller_) => {
          $controller = _$controller_;
      }));


      describe('directive', () => {
          it('should load the data from the api', () => {
              var scope = {};
              var controller = $controller('myController', { $scope: scope });
              scope.entityId = eId;
              expect(scope.entityId).toBe(eId);

              controller.load(); // API call using scope.entityId, to load some data into the scope
              scope.$digest();
              console.log("entities:", controller.entities); // Where the data should be loaded into
          });
      });
    });

我的 Controller 使用“controller as”语法。

我的测试是使用 karma 运行的，它返回了以下错误:

TypeError: $scope.$watch is not a function | at myController.watchChanges

非常感谢任何正确方向的提示!

Answer 1

您创建了一个像空对象一样的范围，这并不正确。您应该像创建 $rootScope 的新实例一样创建它。查看代码示例:

 describe('The app', () => {

    beforeEach(angular.mock.module('myModule'));

    var $controller, $rootScope;
    var eId = 123456;

    beforeEach(angular.mock.inject((_$controller_, _$rootScope_) => {
        $controller = _$controller_;
        $rootScope = _$rootScope_;
    }));


    describe('directive', () => {
        it('should load the data from the api', () => {
            var scope = $rootScope.$new();
            var controller = $controller('myController', { $scope: scope });
            scope.entityId = eId;
            expect(scope.entityId).toBe(eId);

            controller.load(); // API call using scope.entityId, to load some data into the scope
            scope.$digest();
            console.log("entities:", controller.entities); // Where the data should be loaded into
        });
    });
});

希望对您有帮助!