Summary

VCR.py is a Python library inspired by Ruby’s VCR, which simplifies and accelerates testing that involves HTTP requests. VCR.py records HTTP interactions the first time they occur and saves them in a ‘cassette’ file. On subsequent test runs, it replays these interactions, eliminating the need for actual HTTP traffic. This approach allows for offline testing, ensures deterministic test results, and speeds up test execution. If the API changes, simply delete the cassette files, and VCR.py will record new interactions, keeping tests up-to-date.

pytest-recording plugs into pytest to create re-usable API-calling tests.

scotch and Betamax.NET are the VCR.py .NET alternatives, neither of which have been updated in a few years.

Source: VCR.py – records and replays HTTP calls for testing