用Jest模拟TS中的分段分析
用Jest模拟TS中的分段分析
提问于 2020-12-22 16:27:15
我正在尝试编写一个单元测试，以检查是否调用了Analytics的.track方法。由于某些原因，测试一直失败，尽管通过http调用函数确实触发了调用。我不知道我是不是嘲笑错了，或者问题可能是什么？
index.ts：
import { Request } from "../types"
import { getSecret } from "../src/secrets"
import Analytics from "analytics-node"
const logger = (req: Request) => {
const analytics = new Analytics(<string>process.env.WRITE_KEY);
return analytics.track({
userId: req.userId
});
}
export default loggerindex.test.ts：
jest.mock('analytics-node');
import { Request } from "../types"
import logger from "./index"
import Analytics from "analytics-node"
const mockAnalytics = new Analytics(process.env.WRITE_KEY = 'test');
describe('Logger tests', () => {
it(`Should call analytics.track`, () => {
const request: Request = {
userId: 23
}
return logger(request).then(() => {
expect(mockAnalytics.track).toHaveBeenCalled()
});
});
});回答 1
Stack Overflow用户
回答已采纳
发布于 2020-12-23 03:57:36
您正在通过调用自动模拟来使用jest.mock('analytics-node')。
调用jest.mock('analytics-node')返回一个有用的“自动模拟”，您可以用来监视对类构造函数及其所有方法的调用。它用一个模拟构造函数替换ES6类，并用总是返回
undefined的模拟函数替换它的所有方法。方法调用保存在theAutomaticMock.mock.instances[index].methodName.mock.calls中。
例如。
index.ts
import Analytics from 'analytics-node';
export interface Request {
userId: string | number;
}
const logger = (req: Request) => {
const analytics = new Analytics(<string>process.env.WRITE_KEY);
return analytics.track({
userId: req.userId,
anonymousId: 1,
event: '',
});
};
export default logger;index.test.ts
import logger, { Request } from './';
import Analytics from 'analytics-node';
jest.mock('analytics-node');
const mockAnalytics = Analytics as jest.MockedClass<typeof Analytics>;
describe('Logger tests', () => {
afterAll(() => {
jest.resetAllMocks();
});
it(`Should call analytics.track`, () => {
const WRITE_KEY = process.env.WRITE_KEY;
process.env.WRITE_KEY = 'test key';
const request: Request = {
userId: 23,
};
logger(request);
expect(mockAnalytics).toBeCalledWith('test key');
expect(mockAnalytics.mock.instances[0].track).toHaveBeenCalled();
process.env.WRITE_KEY = WRITE_KEY;
});
});单元测试结果：
PASS examples/65412302/index.test.ts
Logger tests
✓ Should call analytics.track (4 ms)
----------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
----------|---------|----------|---------|---------|-------------------
All files | 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: 5.954 s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/65412302
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