Question

我是在Typescript环境中学习玩笑的新用户。

是否有人使用jest spyOn方法测试节点模块库中对函数的调用或能够成功模拟函数？我在打字稿环境中使用玩笑，并尝试在typesafe-actions库中测试功能。

下面的代码清单中提供了一个有关如何尝试使用spyOn的小示例：

import * as typ from 'typesafe-actions';
import { factoryAllPostsAction } from './actions';
describe('action test', ()=>{
    test('test factoryAllPostsAction', ()=>{
        const mockCreateAsync = jest.spyOn(typ, 'createAsyncAction');

        // example wrapper method that calls createAsyncAction
        // in this case it creates an instance of allPosts action
        const asyncAction = factoryAllPostsAction();

        expect(mockCreateAsync).toHaveBeenCalled();
    });
});

我已经上传了小型示例项目here。该测试位于 src / features / post / actions.spec.ts 文件中。

我还尝试过在下面的代码清单中创建手动模拟，这会返回错误bash TypeError: (0 , _typesafeActions.createAsyncAction)(...) is not a function.

jest.mock('typesafe-actions', () => {
    const originalModule = jest.requireActual('typesafe-actions');

    return {
      __esModule: true,
      ...originalModule,
      createAsyncAction: jest.fn().mockReturnValue({}),
    };
  });

import {createAsyncAction} from 'typesafe-actions';
import { factoryAllPostsAction } from './actions';
describe('action test', ()=>{
    test('test factoryAllPostsAction', ()=>{
        // example wrapper method that calls createAsyncAction
        // in this case it creates an instance of allPosts action
        const asyncAction = factoryAllPostsAction();

        expect(createAsyncAction).toHaveBeenCalled();
    });
});

使用Jest模拟打字稿环境中的节点模块库的函数（typesafe-actions）

0 个答案: