如何用茉莉花测试 John papa vm.model 单元测试？

Question

我使用 John papa 角度样式指南，我的控制器看起来像：

跟风John papa style controller style guide:

function testController() {

    var vm = this;

    vm.model = { name: "controllerAs vm test" };
}

我的测试代码如下：

describe('Controller: testController', function () {

    beforeEach(module('myApp'));

    var testController;

    beforeEach(inject(function ($controller) {
        scope = {};

        testController = $controller('testController', {
        });

    }));

    it('should have vm.model defined and testController.vm.model is equal to controllerAs vm test', function () { 
        expect(testController.vm).toBeDefined();  
        expect(testController.vm.model).toBeDefined();     
        expect(testController.vm.model.name).toEqual("controllerAs vm test");
    });
});

结果：

测试失败： 结果消息：预期未定义。 在堆栈中

所以我的问题是我们如何测试 vm.model 和其他变量？我在指南中没有找到合适的指南：controllers

Answer 1

vm 通过vm = this; 等于实例本身

因此，所有属性都直接挂在对象上。

function foo(){
  var vm = this;

  vm.name = 'Josh';
}

var myFoo = new foo();
myFoo.name; // 'Josh';

因此，您需要做的就是改变您的期望以删除 vm 属性。

expect(testController).toBeDefined();  
expect(testController.model).toBeDefined();     
expect(testController.model.name).toEqual("controllerAs vm test");

为了证明这一点，这是您的确切示例以及相关的 Jasmine 测试。

function testController() {

  var vm = this;

  vm.model = {
    name: "controllerAs vm test"
  };
}


angular.module('myApp', [])
  .controller('testController', testController);

describe('Controller: testController', function() {

  beforeEach(module('myApp'));

  var testController;

  beforeEach(inject(function($controller) {
    scope = {};

    testController = $controller('testController', {});

  }));

  it('should have model defined and testController.model.name is equal to controllerAs vm test', function() {
    expect(testController).toBeDefined();
    expect(testController.model).toBeDefined();
    expect(testController.model.name).toEqual("controllerAs vm test");
  });

  it('should not have a property called vm', function() {
    expect(testController.vm).toBeUndefined();
  });
});

<link href="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.2.1/jasmine.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.2.1/jasmine.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.2.1/jasmine-html.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.2.1/boot.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.0-beta.4/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.0-beta.4/angular-mocks.js"></script>

Answer 2

testController 是vm，因为您在控制器中设置了var vm = this。因此，为了使您的测试代码与您的控制器代码更相似，您也可以尝试在测试中将您的控制器设置为 vm 而不是 testController

describe('Controller: testController', function () {
    // we work with "vm" instead of "testController" to have consistent verbiage
    // in test and controller
    var vm;

    beforeEach(module('app'));
    beforeEach(inject(function ($controller) {
        vm = $controller('testController', {}, {});
    }));

    it('should have vm.model defined and testController.vm.model is equal to controllerAs vm test', function () {

        // vm=this in controller
        expect(vm)
            .toBeDefined();

        // Testing primitives
        expect(vm.foo)
            .toBeDefined();
        expect(vm.foo)
            .toEqual('bar');

        // Testing objects
        expect(vm.model)
            .toBeDefined();
        expect(vm.model.name)
            .toEqual("Batman");

        // Testing a method
        expect(vm.greet())
            .toBeDefined();
        expect(vm.greet())
            .toEqual('Hello There');
    });
});

控制器代码

(function () {
    'use strict';

    angular
        .module('app')
        .controller('testController', testController);

    /* @ngInject */
    function testController() {
        var vm = this;

        // Primitives
        vm.foo = 'bar';

        // Objects
        vm.model = {
            name: 'Batman'
        };

        // Methods
        vm.greet = function () {
            return 'Hello There';
        };
    }
})();

希望这会有所帮助。祝你好运。

Answer 3

我将创建一个新模块并将其作为依赖项注入到 app 模块中，以使其简单且可测试。使用 John Papa 的样式指南测试控制器：

(function () {
  'use strict';

  angular
    .module('test')
    .controller('testController', testController);

  function testController() {
    var vm = this;
    vm.model = { name: "controllerAs vm test" };
  }
})();

规范现在看起来像这样：

'use strict';

describe('testController', function() {
  var testController;
  beforeEach(module('test'));

  beforeEach(function () {
    inject(function($injector) {
      testController = $injector.get('$controller')('testController', {});
    });
  });

  it('should have model defined and testController.name is equal to controllerAs vm test', function() {
    expect(testController).toBeDefined();
    expect(testController.name).toEqual("controllerAs vm test");
  });
});

希望这对寻找类似解决方案的人有所帮助。