The Mock Service Worker (MSW) API mocking library allows developers to test web applications without using an actual back-end, setting up a mocking server, or stubbing native http/https/fetch implementations. MSW mocks both Rest and GraphQL APIs. MSW received the JavaScript Open Source Awards this year.
An increasingly popular approach to testing UI components consists of rendering and exercising the component under test as much as possible in the same conditions and in the same way as a real user would. The rationale is to avoid testing implementation details linked to the component’s internal API.
