WireMock is a flexible library for stubbing and mocking web services. Unlike general purpose mocking tools it works by creating an actual HTTP server that your code under test can connect to as it would a real web service.
It supports HTTP response stubbing, request verification, proxy/intercept, record/playback of stubs and fault injection, and can be used from within a unit test or deployed into a test environment.
Although it’s written in Java, there’s also a JSON API so you can use it with pretty much any language out there.
Some scenarios you might want to consider WireMock for:
- Testing mobile apps that depend on third-party REST APIs
- Creating quick prototypes of your APIs
- Injecting otherwise hard-to-create errors in 3rd party services
- Any unit testing of code that depends on a web service