Pact-msw NPM | npm.io

pact-msw

pact-msw is a Node.js library that allows you to build Pact contracts by leveraging msw. This library provides an easy way to generate contracts that can be used for testing and verifying API interactions between consumer and provider.

Install

yarn add -D pact-msw

Usage

Here is an example of how to use pact-msw:

import { setupServer } from 'msw/node';
import { pactProvider, rest } from 'pact-msw';

const server = setupServer();

const provider = pactProvider({
  consumer: 'test-consumer',
  provider: 'test-provider',
});

provider.removePact();

beforeAll(() => {
  server.listen();
  provider.loadPact();
});

afterEach(() => {
  server.resetHandlers();
});

afterAll(() => {
  server.close();
  provider.writePact();
});

it('get all movies', async () => {
  const mockMovies = rest({
    description: 'a request to list all movies',
    method: 'get',
    path: '*/movies',
    response: [
      {
        id: 1,
        name: 'Movie 1',
        year: 2008,
      },
      {
        id: 2,
        name: 'Movie 2',
        year: 2008,
      },
    ],
  });
  server.use(...provider.toHandlers(mockMovies));

  const movies = await fetchMovies();

  expect(movies).toEqual(mockMovies.response);
});

You can find more example to mock