如何模拟angularjs app的后端？

Question

我想测试一个运行$ resource的工厂方法.我的测试会嘲笑那个尚不存在的真实后端.

这是一个示例工厂代码:

app.factory( 'Global', function( $resource ){
  var Jogas = $resource('/jogasok/:id', {'id': '@id'}, {
    'ujBerlet': {'method': 'POST', 'params': {'berlet': true}}
  });
  var jogasok = Jogas.query();
  return {
    getJogasok: function() {
      return jogasok;
    }
  };
})

我的测试是检查查询是否已经完成.

如果我用以下内容初始化我的应用:

app.run( function run ($httpBackend) {
  $httpBackend.whenGET('/jogasok').respond([
        {id: 1, name: 'asdfasdf'}, 
        {id: 2, name: '2wrerwert'}
      ]);
})

并在我的浏览器中打开应用程序,然后一切似乎都很好,我在浏览器中有虚拟数据.

但是,当我拿出上面的运行代码并编写测试时,事情就不起作用了.

describe( 'Global Service: ', function() {

  beforeEach( module('bkJoga') );
  beforeEach( inject(function($httpBackend) {
    $httpBackend.whenGET('/jogasok').respond([
      {id: 1, name: 'asdfasdf'}, 
      {id: 2, name: '2wrerwert'}
    ]);
  }));

  it('getJogasok should return everyone', inject(function(Global) {
    expect(JSON.stringify(Global.getJogasok())).toBe(JSON.stringify([
      {id: 1, name: 'asdfasdf'}, 
      {id: 2, name: '2wrerwert'}
    ]));
  }));
});

失败.

Answer 1

这是您发布工厂时的工作测试.我为注入的httpBackend添加了一个变量$ httpBackend.并调用$ httpBackend.flush().fiddle-demo(阅读结尾以获取小提琴内容的完整描述)

describe( 'Global Service: ', function() {
    var Global, $httpBackend

    // load the relevant application module, with the service to be tested
    beforeEach( module('bkJoga') );

    beforeEach( function() {

        // inject the mock for the http backend
        inject(function(_$httpBackend_) {
            $httpBackend = _$httpBackend_;
        });
        // mock the response to a particular get request
        $httpBackend.whenGET('/jogasok').respond([
            {id: 1, name: 'asdfasdf'}, 
            {id: 2, name: '2wrerwert'}
        ]);
        // inject the service to be tested
        inject(function(_Global_) {
            Global = _Global_;
        });
    });

    it('should exist', function() {
        expect(!!Global).toBe(true);
    });

    it('getJogasok should return everyone', function() {
        $httpBackend.flush();    // <------------ need to flush $httpBackend
        expect(JSON.stringify(Global.getJogasok())).toBe(JSON.stringify([
            {id: 1, name: 'asdfasdf'}, 
            {id: 2, name: '2wrerwert'}
        ]));
    });
});

无论如何,我会以不同的方式重写工厂,因为,正如当前编写的那样,它仅在实例化时才查询数据库var jogasok = Jogas.query();.因为angularjs中的服务是单例,所以在您的应用程序中,您将只拥有实例化时的数据.因此,以后对数据的修改不会反映在您的工厂中.以下是反映这一想法的工厂及其单元测试的示例.

工厂:

app.factory('GlobalBest', function ($resource) {
    return $resource('/jogasok/:id', {
        'id': '@id'
    }, {
        'ujBerlet': {
            'method': 'POST',
                'params': {
                'berlet': true
            }
       }
    });
});

考试:

describe('GlobalBest Service: ', function () {
    var srv, $httpBackend;

    beforeEach(module('bkJoga'));

    beforeEach(function () {
        // inject the mock for the http backend
        inject(function (_$httpBackend_) {
            $httpBackend = _$httpBackend_;
        });

        // inject the service to be tested
        inject(function (_GlobalBest_) {
            srv = _GlobalBest_;
        });
    });

    it('should exist', function () {
        expect( !! srv).toBe(true);
    });

    it('query() should return everyone', function () {

        // mock the response to a particular get request
        $httpBackend.whenGET('/jogasok').respond([{
            id: 1,
            name: 'asdfasdf'
        }, {
            id: 2,
            name: '2wrerwert'
        }]);

        // send request to get everyone
        var data = srv.query();

        // flush the pending request
        $httpBackend.flush();
        expect(JSON.stringify(data)).toBe(JSON.stringify([{
            id: 1,
            name: 'asdfasdf'
        }, {
            id: 2,
            name: '2wrerwert'
        }]));
    });

    it('get({id: 1}) should return object with id=1', function () {
        // mock the response to a particular get request
        $httpBackend.whenGET('/jogasok/1').respond({
            id: 1,
            name: 'asdfasdf'
        });
        var datum = srv.get({
            id: 1
        });
        $httpBackend.flush();
        expect(JSON.stringify(datum)).toBe(JSON.stringify({
            id: 1,
            name: 'asdfasdf'
        }));
    });
});

我写了一个fiddle-demo有3个版本的服务:你的原始服务'Global',一个返回query()方法的新版本'GlobalNew',最后是一个直接返回$ resource的版本'GlobalBest'.希望这可以帮助.