javascript - 如何在单元测试中的请求之间更改 $httpBackend when[method] 语句？

Question

在我的测试中，我启动了一些模型数据并模拟响应:

beforeEach(function(){
   var re = new RegExp(/^http\:\/\/.+?\/users-online\/(.+)$/);
   $httpBackend.whenGET(re).respond({id:12345, usersOnline:5000});
});      

it('should find 5000 users in channel 12345', function(){
    expect( UsersOnlineService.data.usersOnline).toEqual( 50000);
});

然后在下一个测试语句中说我想要 channel 的更新值。每个人都离开了，假设这会触发其他行为，所以我需要模拟第二个请求，以便测试该行为。

将 $httpBackend.whenGET 添加到下一个 it 语句不会覆盖 beforeEach 值。它似乎使用原始模拟值:

it('should find 0 users in channel 12345', function(){
    $httpBackend.whenGET(re).respond({id:12345, usersOnline:0});
    expect( UsersOnlineService.data.usersOnline).toEqual( 50000); //fails
});

如果我在没有 beforeEach 的情况下这样做，两者都会失败并出现常见的“unexpectedGet”错误。

it('should find 5000 users in channel 12345', function(){
     var re = new RegExp(/^http\:\/\/.+?\/users-online\/(.+)$/);
     $httpBackend.whenGET(re).respond({id:12345, usersOnline:5000});
    expect( UsersOnlineService.data.usersOnline).toEqual( 50000); //fails
});

it('should find 0 users in channel 12345', function(){
      var re = new RegExp(/^http\:\/\/.+?\/users-online\/(.+)$/);
     $httpBackend.whenGET(re).respond({id:12345, usersOnline:0});
    expect( UsersOnlineService.data.usersOnline).toEqual( 0); //fails
});

如何在请求之间调制模拟数据？

我也试过:

• 在 it 语句之间夹入一个 beforeEach
• 将 .response( 设置为 fakeResponse 变量。然后在每个 it 语句中更改 fakeResponse 值.

Answer 1

重置期望值()

执行

afterEach($httpBackend.resetExpectations);

文档

Resets all request expectations, but preserves all backend definitions. Typically, you would call resetExpectations during a multiple-phase test when you want to reuse the same instance of $httpBackend mock.

文档来源:https://docs.angularjs.org/api/ngMock/service/ $http后端