[英]Unit test a function which has a function with callback (request module)
我正在我的 NodeJS 項目中進行測試,我有以下 function 我想進行單元測試:
function myRequest(targetUrl, reqBody) {
return new Promise((resolve, reject) => {
request.post(targetUrl, { json: reqBody }, (error, response, body) => {
if (!error && response.statusCode === 200) {
resolve(body.transferId);
} else {
reject(error || body.description || body);
}
});
});
}
我正在使用摩卡和西農。 如何測試這個 function?
首先,我使用自己的模擬請求模塊對成功場景進行了測試。 現在,我想做錯誤場景,這可能是 function 后出現錯誤。 我怎么能在不更改或制作新的請求模擬(返回錯誤)的情況下做到這一點? 有可能嗎?
這是單元測試解決方案,您應該使用sinon.stub
:
例如index.ts
:
import request from 'request';
export function myRequest(targetUrl, reqBody) {
return new Promise((resolve, reject) => {
request.post(targetUrl, { json: reqBody }, (error, response, body) => {
if (!error && response.statusCode === 200) {
resolve(body.transferId);
} else {
reject(error || body.description || body);
}
});
});
}
index.spec.ts
:
import { myRequest } from '.';
import chai from 'chai';
import sinon from 'sinon';
import chaiAsPromised from 'chai-as-promised';
import request from 'request';
chai.use(chaiAsPromised);
const { expect } = chai;
describe('myRequest', () => {
it('should request success', async done => {
// @ts-ignore
const stub = sinon.stub(request, 'post').callsFake((uri, options, callback) => {
const mResponse = { statusCode: 200 };
const mBody = { transferId: 1 };
callback(null, mResponse, mBody);
done();
});
const actualValue = await myRequest('url', {});
// @ts-ignore
stub.calledOnceWith('url', { json: {} });
expect(actualValue).to.eq(1);
stub.restore();
});
it('should throw error use request error', async done => {
const mError = new Error('Internal server error');
const mResponse = { statusCode: 500 };
// @ts-ignore
const stub = sinon.stub(request, 'post').callsFake((uri, options, callback) => {
callback(mError, mResponse, null);
done();
});
await expect(myRequest('url', {})).to.be.rejectedWith(mError);
// @ts-ignore
stub.calledOnceWith('url', { json: {} });
stub.restore();
});
it('should throw error use body.description as error message', async done => {
const mResponse = { statusCode: 500 };
const mBody = { description: 'some error' };
// @ts-ignore
const stub = sinon.stub(request, 'post').callsFake((uri, options, callback) => {
callback(null, mResponse, mBody);
done();
});
await expect(myRequest('url', {})).to.be.rejectedWith(mBody.description);
// @ts-ignore
stub.calledOnceWith('url', { json: {} });
stub.restore();
});
it('should throw error use body as error message', async done => {
const mResponse = { statusCode: 500 };
const mBody = 'some error';
// @ts-ignore
const stub = sinon.stub(request, 'post').callsFake((uri, options, callback) => {
callback(null, mResponse, mBody);
done();
});
await expect(myRequest('url', {})).to.be.rejectedWith(mBody);
// @ts-ignore
stub.calledOnceWith('url', { json: {} });
stub.restore();
});
});
覆蓋率 100% 的單元測試結果:
myRequest
✓ should request success
✓ should throw error use request error
✓ should throw error use body.description as error message
✓ should throw error use body as error message
4 passing (13ms)
---------------|----------|----------|----------|----------|-------------------|
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s |
---------------|----------|----------|----------|----------|-------------------|
All files | 100 | 100 | 100 | 100 | |
index.spec.ts | 100 | 100 | 100 | 100 | |
index.ts | 100 | 100 | 100 | 100 | |
---------------|----------|----------|----------|----------|-------------------|
源碼: https://github.com/mrdulin/mocha-chai-sinon-codelab/tree/master/src/stackoverflow/58822996
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