用Jest测试函数中的函数？
用Jest测试函数中的函数？
提问于 2019-05-01 21:10:21
我正在使用Jest测试Redux Action Creator
这是动作创建者：
const addDiscount = ({ code }) => (dispatch, getState) => {
const { id } = getState().token;
return dispatch({
apiCall: discount.put({
body: {
code
},
id
}),
types: ADD_DISCOUNT.triplet
});
};这是我的测试：
const apiCallMock = jest.fn();
const dispatch = jest.fn(() => {
return {
apiCall: apiCallMock
};
});
const customerOrderId = 'customer-order-id';
const getState = jest.fn(() => ({
token: {
customerOrderId
}
}));
const res = addDiscount({ code: 'abc123' })(dispatch, getState);
console.log(res);
console.log(dispatch.mock.calls[0][0]);
console.log(apiCallMock.mock);如果我尝试console.log(res)，结果是undefined。
console.log(dispatch.mock.calls[0][0]);向我显示了类型，但apiCall是一个尚未运行的函数。
console.log(apiCallMock.mock);似乎尚未运行
回答 1
Stack Overflow用户
发布于 2019-11-12 17:21:11
以下是仅使用jest的单元测试解决方案
index.ts
import { discount } from './discount';
export const ADD_DISCOUNT = {
triplet: 'triplet'
};
export const addDiscount = ({ code }) => (dispatch, getState) => {
const { id } = getState().token;
return dispatch({
apiCall: discount.put({ body: { code }, id }),
types: ADD_DISCOUNT.triplet
});
};discount.ts
export const discount = {
put(obj) {
return obj;
}
};index.spec.ts
import { addDiscount, ADD_DISCOUNT } from './';
import { discount } from './discount';
describe('addDiscount', () => {
test('should ', () => {
const customerOrderId = 'customer-order-id';
const mDispatch = jest.fn();
const mGetState = jest.fn().mockReturnValueOnce({ token: { id: customerOrderId } });
const putSpy = jest.spyOn(discount, 'put');
addDiscount({ code: 'abc123' })(mDispatch, mGetState);
expect(mGetState).toBeCalledTimes(1);
expect(mDispatch).toBeCalledWith({
apiCall: { body: { code: 'abc123' }, id: customerOrderId },
types: ADD_DISCOUNT.triplet
});
expect(putSpy).toBeCalledWith({ body: { code: 'abc123' }, id: customerOrderId });
});
});100%覆盖率的单元测试结果：
PASS src/stackoverflow/55936794/index.spec.ts (9.651s)
addDiscount
✓ should dispatch action correctly (7ms)
-------------|----------|----------|----------|----------|-------------------|
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s |
-------------|----------|----------|----------|----------|-------------------|
All files | 100 | 100 | 100 | 100 | |
discount.ts | 100 | 100 | 100 | 100 | |
index.ts | 100 | 100 | 100 | 100 | |
-------------|----------|----------|----------|----------|-------------------|
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 11.79s源代码：https://github.com/mrdulin/jest-codelab/tree/master/src/stackoverflow/55936794
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/55936794
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