Selfie: snapshot testing and memoizing for Python, JVM, and (your PR here)

Key features

• Just add a test dependency (py, jvm), zero setup, zero config.
• Snapshots can be inline literals or on disk.
• Use expect_selfie for testing or cache_selfie for memoizing expensive API calls.
• Disk snapshots are automatically garbage collected when the test class or test method is removed.
• Snapshots are just strings. Use html, json, markdown, whatever. No magic serializers.
• Record multiple facets of the entity under test, e.g. for a web request...
  • store the HTML as one facet
  • store HTML-rendered-to-markdown as another facet
  • store cookies in another facet
  • assert some facets on disk, others inline
  • see gif above for live demo, detailed example here

Python and JVM ports are both production-ready, other platforms on the way: js, .NET, go, ...

Documentation

• Quickstart (py, jvm)
• Facets (py, jvm)
• Caching / memoizing (py, jvm)
• Why selfie (py, jvm)
• API reference (py, jvm)

Contributing

PRs welcome! Horror stories and glory stories too, share your experience! See CONTRIBUTING.md.

Acknowledgements

Heavily inspired by origin-energy's java-snapshot-testing, which in turn is heavily inspired by Facebook's jest-snapshot.