测试redux功能

Question

我正在测试类似的函数

export default (middlewares) => {
return createStore(rootReducer, applyMiddleware(...middlewares));
};

为此，我用笑话编写了一个模拟测试

import { createStore } from 'redux';
import createGlobalStore from '../store';
jest.mock('redux');
describe('Store test', () => {
it('testing create global store', () => {
const mockTestValue = 1;
createStore.mockResolvedValue(mockTestValue);
expect(createGlobalStore([])).toBe(mockTestValue);
});
});

但是我的代码失败了。

expect(received).toBe(expected) // Object.is equality
Expected: 1
Received: {}

我不确定我是否写了正确的测试用例。有人能帮我纠正这个问题或更好地编写这个测试用例吗？

Answer 1

您正在编写单元测试。以下是更完整的单元测试代码。

index.ts:

import { createStore, applyMiddleware } from 'redux';
function rootReducer(state) {
return state;
}
export default (middlewares) => {
return createStore(rootReducer, applyMiddleware(...middlewares));
};

index.test.js:

import createGlobalStore from './';
import { createStore, applyMiddleware } from 'redux';
jest.mock('redux');
describe('63369776', () => {
afterAll(() => {
jest.resetAllMocks();
});
it('should pass', () => {
const mockTestValue = 1;
createStore.mockReturnValueOnce(mockTestValue);
applyMiddleware.mockReturnValueOnce('store enhancer');
expect(createGlobalStore([])).toBe(mockTestValue);
expect(createStore).toBeCalledWith(expect.any(Function), 'store enhancer');
expect(applyMiddleware).toBeCalledWith(...[]);
});
});

带覆盖率报告的单元测试结果：

PASS  src/stackoverflow/63369776/index.test.js (11.603s)
63369776
✓ should pass (7ms)
----------|----------|----------|----------|----------|-------------------|
File      |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
----------|----------|----------|----------|----------|-------------------|
All files |       75 |      100 |       50 |       75 |                   |
index.js |       75 |      100 |       50 |       75 |                 4 |
----------|----------|----------|----------|----------|-------------------|
Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        12.977s

源代码：https://github.com/mrdulin/jest-codelab/tree/master/src/stackoverflow/63369776