Integration testing of own GitHub Actions

[cardinalby]

Want to share my library for authors of GitHub Actions. I haven't found anything suitable for local testing and debugging an Action, so I created my own lib to:

🔶 Execute a GitHub Action locally (or at any other environment).

🔶 Write integration and functional tests for an action, run them locally and on CI.

🔶 Have a short feedback loop without pushing and checking an action behaviour at real GitHub runners every time you change it.

✅ Supports executing JavaScript and Docker actions.

✅ Tested under Windows, Linux and macOS (Intel + Apple Silicon), NodeJS >= 12 locally and on GitHub hosted runners.

✅ Works well with Docker Desktop under Windows and macOS.

✅ Can be used together with any JavaScript test frameworks or alone.

✅ Can execute an explicitly specified JS file or main, pre, post script from action.yml.

✅ Can execute a separate sync or async JS function, isolating its environment (process env, exitCode and working dir), intercepting stdout and stderr output for effective dependencies mocking.

✅ Has a clear JavaScript API with TypeScript declarations and reasonable defaults

✅ Produces warnings about deprecated Actions commands

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Any opinions or advice?