javascript - 在 AngularJS 中模拟 Controller 单元测试的依赖服务

Question

我在对 Ionic 应用程序进行单元测试时遇到问题。我见过类似的问题，但没有解决我的问题。

基本上，这是我的controller.js

angular.module('starter.controllers')
.controller('myController', function($scope, myService) {

    $scope.test = function() {
        return myService.getTestVariable();
    };

});

这是我的service.js

angular.module('starter.services')
.factory('myService', function() {

    var self = this;
    self.testVariable = true;

    return {
        getTestVariable : function() {
            return self.testVariable;
        }
    };
});

模块在 app.js 文件中创建:

angular.module('starter', ['starter.controllers', 'starter.services']);           
angular.module('starter.services', []);
angular.module('starter.controllers', []);

现在，我想测试 Controller 并使用服务的模拟版本，因此我设置了如下测试:

describe('Controller: myController', function() {
    var scope, controller, serviceMock;

    beforeEach(function() {
        module('starter');
    });

    beforeEach(function () {
        serviceMock= {
            getTestVariable : function() {return true;}
        };

        module(function ($provide) {
            $provide.value('myService', serviceMock);
        });
    });

    beforeEach(inject(function($rootScope, $controller) {
        scope = $rootScope.$new();
        controller = $controller('myController', {
            $scope: scope
        });
    }));

    it('should work as expected', function(){
        spyOn(serviceMock, 'getTestVariable').and.callThrough();
        scope.test();
        expect(serviceMock.getTestVariable).toHaveBeenCalled();
    });
});

但是，当我尝试运行测试时，它会打印错误:

TypeError: 'undefined' is not a function (evaluating 'myService.getTestVariable()')
    at <dir>/controller.js:5

为什么会发生这种情况？

Answer 1

我在代码中没有看到任何问题，只需进行模块初始化 angular.module('starter.services', []); angular.module('starter.controllers', []); 在使用之前。

请参阅下面的示例。您提供的相同代码可以完美运行。

angular.module('starter.controllers', []);
angular.module('starter.controllers')
  .controller('myController', function($scope, myService) {

    $scope.test = function() {
      return myService.getTestVariable();
    };

  });

angular.module('starter.services', []);
angular.module('starter.services')
  .factory('myService', function() {

    var self = this;
    self.testVariable = true;

    return {
      getTestVariable: function() {
        return self.testVariable;
      }
    };
  });

angular.module('starter', ['starter.controllers', 'starter.services']);

describe('Controller: myController', function() {
  var scope, controller, serviceMock;

  beforeEach(function() {
    module('starter');
  });

  beforeEach(function() {
    serviceMock = {
      getTestVariable: function() {
        return true;
      }
    };

    module(function($provide) {
      $provide.value('myService', serviceMock);
    });
  });

  beforeEach(inject(function($rootScope, $controller) {
    scope = $rootScope.$new();
    controller = $controller('myController', {
      $scope: scope
    });
  }));

  it('should work as expected', function() {
    spyOn(serviceMock, 'getTestVariable').and.callThrough();
    scope.test();
    expect(serviceMock.getTestVariable).toHaveBeenCalled();
  });
});

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