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Controlled GitHub Actions Lab

This lab removes the need to hunt for a random public workflow. Run it in your disposable git-github-lab repository.

1. Copy the demo

Copy these files into your student lab:

  • examples/actions/demo/app.py → app.py
  • examples/actions/demo/tests/test_app.py → tests/test_app.py
  • examples/actions/basic-python-ci.yml → .github/workflows/ci.yml

Commit and push them.

2. Inspect before running

Open .github/workflows/ci.yml and identify:

  • the events under on
  • the job under jobs
  • the runner
  • each step
  • the command that decides whether the check passes

3. Prove green

Open the Actions tab or the commit checks. Confirm the tests pass.

4. Break it deliberately

In tests/test_app.py, change the expected result for add(2, 3) from 5 to 6, commit, and push.

Predict the result before checking GitHub.

Confirm the workflow fails and inspect the failing test output.

5. Repair

Restore the correct expectation, commit, push, and verify the workflow returns to green.

Pass condition

You can explain why CI is useful, what caused the red check, and why a green check only proves the checks that actually ran—not all possible correctness.