WireMock - WireMock
wiremock.org/, posted 2018 by peter in api development free opensource software testing
WireMock is a simulator for HTTP-based APIs. Some might consider it a service virtualization tool or a mock server.
It enables you to stay productive when an API you depend on doesn't exist or isn't complete. It supports testing of edge cases and failure modes that the real API won't reliably produce. And because it's fast it can reduce your build time from hours down to minutes.