Playwright-easy-network-stub NPM

playwright-easy-network-stub

An easy class to mock a lot of network requests in playwright.

Motivation 💥

When running tests in playwright, sometimes you want to mock all network requests. Especially when running tests in a CI environment. This package provides an easy and type safe way to mock network requests for a whole API.

Features 🔥

✅ Easy to setup and use

✅ Type safe url and query parameters

✅ Add your own parameter matchers

✅ Works asynchronously (Promise based)

✅ Supports failing of stubbed requests

✅ Supports EventSource & ndjson

✅ Supports WebSockets (beta)

✅ No production dependencies (You need to have playwright installed, of course)

✅ ESM & CJS exports

The primary use case for this package is to create a mock server for your tests so that they do not need real network requests.

Built With 🔧

TypeScript

Usage Example 🚀

const posts = [0, 1, 2, 3, 4, 5].map(x => ({ postId: x, text: `test${x}` }));

const blogStub = new PlaywrightEasyNetworkStub(/MyServer\/api\/Blog/);

blogStub.init();

blogStub.stub('GET', 'posts', () => {
  return posts;
});

// Match Example: GET: /MyServer/api/Blog/posts/123
blogStub.stub('GET', 'posts/{id:number}', ({ params }) => {
  return posts.find(x => x.postId === params.id);
});

// Match Example: POST: /MyServer/api/post
blogStub.stub('POST', 'posts', ({ body, params }) => {
  posts.push({ postId: body.postId, text: body.text });
});

// Match Example: POST: /MyServer/api/Blog/test/true?query=myValue&secondQuery=myOtherValue
// Note: The order of the query parameters is not important
blogStub.stub('POST', 'test/{something:boolean}?{query:string}&{secondQuery:number}', ({ body, params }) => {
  console.log(params.something);
  console.log(params.query);
  console.log(params.secondQuery);
  console.log(body);
});

// Here we use the stub2<>() method to create a stub with a typed body
blogStub.stub2<MyRequest>()('POST', 'test', ({ body }) => {
  console.log(body.myValue);
});

// You can mark query params as optional with a '?'
// Match Example: GET: /MyServer/api/Blog/test
// Match Example: GET: /MyServer/api/Blog/test?refresh=true
blogStub.stub('GET', 'test?{refresh?:boolean}', ({ body, params }) => {
  if (params.refresh) {
    console.log('Refreshing');
  }
  console.log(body.myValue);
});

// You can mark query params as arrays with a '[]'
// Match Example: GET: /MyServer/api/Blog/test?props=1
// Match Example: GET: /MyServer/api/Blog/test?props=1&props=2
blogStub.stub('GET', 'test?{props:number[]}', ({ params }) => {
  params.props.forEach(x => console.log(x));
});

Strongly typed api parameters

You can add types to parameters and they will be parsed. Out of box 'string', 'number' and 'boolean' are supported. You can add your own types and parsers though.

Stub streams

import { StreamResponseHandler } from 'easy-network-stub/stream';

const srh = new StreamResponseHandler();
blogStub.stub('POST', 'test', () => srh);

srh.send('Hello');
srh.send('World');
srh.close();

Contributing 🧑🏻‍💻

Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated.

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement". Don't forget to give the project a star! Thanks again!