如何使用 Jest 测试 Reflux 动作

Posted 2023-02-22

【中文标题】如何使用 Jest 测试 Reflux 动作

【英文标题】：How to test Reflux actions with Jest

【发布时间】：2015-04-12 08:17:52

【问题描述】：

我在测试 Reflux 操作是否在我的应用程序中正确触发时遇到了困难，实际上它们似乎根本不适用于 Jest。我有这个示例测试：

jest.autoMockOff();

describe('Test', function () 
  it('Tests actions', function () 
    var Reflux = require('../node_modules/reflux/index');

    var action = Reflux.createAction('action');
    var mockFn = jest.genMockFn();

    var store = Reflux.createStore(
      init: function () 
        this.listenTo(action, this.onAction);
      ,
      onAction: function () 
        mockFn();
      
    );

    action('Hello World');
    expect(mockFn).toBeCalled();
  );
);

哪些输出：

● Test › it Tests actions
  - Expected Function to be called.
    at Spec.<anonymous> (__tests__/Test.js:20:20)
    at Timer.listOnTimeout [as ontimeout] (timers.js:112:15)

即使使用 Jasmine 异步函数，它似乎也不起作用

jest.autoMockOff();

describe('Test', function () 
  it('Tests actions', function () 
    var Reflux = require('../node_modules/reflux/index');

    var action = Reflux.createAction('action');
    var mockFn = jest.genMockFn();

    var flag = false;

    var store = Reflux.createStore(
      init: function () 
        this.listenTo(action, this.onAction);
      ,
      onAction: function () 
        mockFn();
        flag = true;
      
    );

    runs(function () 
      action();
    );

    waitsFor(function () 
      return flag;
    , 'The action should be triggered.', 5000);

    runs(function () 
      expect(mockFn).toBeCalled();
    );
  );
);

给我...

FAIL  __tests__/Test.js (6.08s)
● Test › it Tests actions
  - Throws: [object Object]

有人做过吗？

【参考方案1】：

我想通了！我只需要使用 Jest 自己的方法来快进任何计时器。即只需添加行

jest.runAllTimers();

所以我的第一个例子的工作版本是

jest.autoMockOff();

describe('Test', function () 
  it('Tests actions', function () 
    var Reflux = require('../node_modules/reflux/index');

    var action = Reflux.createAction('action');
    var mockFn = jest.genMockFn();

    var store = Reflux.createStore(
      init: function () 
        this.listenTo(action, this.onAction);
      ,
      onAction: function () 
        mockFn();
      
    );

    action('Hello World');

    jest.runAllTimers();

    expect(mockFn).toBeCalled();
  );
);