Mock Service Worker Library Enables Resilient REST and GraphQL API Testing

Mock Service Worker Library Enables Resilient REST and GraphQL API Testing

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.

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. The mentioned approach seeks to decrease the likelihood of having to change tests, not in response to a change in specifications, but in response to a change in implementation of the component.

However, as user actions are exercised on an actual rendered component, they may trigger real effects (e.g., remote data fetching, API calls) that need to be mocked or stubbed.

While a mocking server is an actual server, the mocking server may differ from the production server in ways that affect the confidence derived from the testing (e.g., different architecture, or technologies). A mocked server may also require to modify the component code to point requests to the mocked server endpoint.

The native stubbing approach avoids modifying the component code for testing purposes. However, having tests passing against an altered version of a native fetch browser method does not completely guarantee that the same tests will pass against the unaltered version of fetch.

javascript rest graphql web development

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