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polylith-migrate-verify-stability

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[Internal sub-skill of `polylith-migrate-orchestrator`. Do not load directly — load `polylith-migrate-orchestrator` first, which drives all phases.] Verify that the migration did not break the project by running test discovery, checking for circular imports, and ensuring the compatibility shim covers all necessary symbols.

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Source SKILL.md: https://github.com/DavidVujic/python-polylith/blob/HEAD/.agents/skills/polylith/migrate-project/polylith-migrate-verify-stability/SKILL.md

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Skill: polylith-migrate-verify-stability

Goal

Verify that the migration did not break the project by:

  1. Running test discovery and comparing the test count with the baseline
  2. Checking for circular imports
  3. Ensuring the compatibility shim covers all necessary symbols

Inputs

  • Project name (from migration/<project-name>/state.md)
  • Test command (from migration/<project-name>/state.md)
  • Baseline test count (from migration/<project-name>/state.md)

Steps

1. Run test discovery

  1. Run the test discovery command from migration/${PROJECT}/state.md.
  2. Compare the test count with the baseline from migration/${PROJECT}/state.md.
  3. Record any discrepancies in migration/${PROJECT}/stability_report.md.

2. Run a subset of tests

  1. Run a representative subset of tests using the test command from migration/${PROJECT}/state.md.
  2. Record any test failures in migration/${PROJECT}/stability_report.md.

3. Check for circular imports

  1. Verify that no circular imports remain by reviewing migration/${PROJECT}/circular_imports_resolved.md.
  2. Record any remaining circular imports in migration/${PROJECT}/stability_report.md.

4. Verify shim coverage

  1. Ensure the compatibility shim (projects/${PROJECT}/${ORIG_TOP_NS}/__init__.py) covers all necessary symbols by comparing it with the original namespace's exports.
  2. Record any missing symbols in migration/${PROJECT}/stability_report.md.

Output

  • A report file: migration/<project-name>/stability_report.md summarizing:
    • Test count before and after migration
    • Test failures (if any)
    • Circular import status
    • Shim coverage status

Verify

  1. Confirm that migration/<project-name>/stability_report.md exists and is not empty.
  2. Verify that:
    • The test count matches the baseline
    • No test failures are reported
    • No circular imports remain
    • The shim covers all necessary symbols

Commit

git add migration/${PROJECT}/stability_report.md
git commit -m "migrate(${PROJECT}): phase <N> — verify-stability"

<N> is this phase's number from the polylith-migrate-orchestrator table (the single source of truth) — do not hardcode it.