Summary

The Helm chart Python tests previously lived as their own workspace
member at helm-tests/ with a dedicated apache-airflow-helm-tests
package. The chart sources and tests are inseparable in practice, so
this collapses them into a single chart workspace member: the test
files move under chart/tests/, and helm-tests/pyproject.toml is
merged into chart/pyproject.toml. The chart pyproject adopts the
former helm-tests pytest config, the mypy dependency-group, and the
test-only deps on apache-airflow-devel-common and
apache-airflow-providers-cncf-kubernetes.

What stays (user/CI-visible names)

Intentionally not renamed in this PR — that would have a much wider
ripple in CI/release tooling than the directory move itself:

• breeze testing helm-tests — command name unchanged.
• mypy-helm-tests — prek hook id unchanged (now lives in
  chart/.pre-commit-config.yaml, with the entry pointing at the new
  chart/tests folder).
• run-helm-tests — selective-checks output / CI gate variable.
• helm-tests.yml — CI workflow file.
• The directory chart/tests/helm_tests/ keeps the Python package
  name helm_tests so test imports and --test-type X arguments
  don't shift.

What changed

• Root pyproject.toml: workspace member ("helm-tests" → "chart"),
  [tool.uv.sources], apache-airflow-helm-chart = false constraint
  rows, ruff per-file ignores, mypy include path, dev dependency-group.
• .github/CODEOWNERS: folded the /helm-tests/ line into the
  existing /chart/ entry (same owners, just absorbs the test path).
• .github/dependabot.yml and dev/update_github_branch_config.py:
  /helm-tests → /chart.
• Breeze internals — global_constants.all_helm_test_packages,
  run_tests.TEST_GROUP_TO_TEST_FOLDERS[GroupOfTests.HELM],
  run_tests.find_pytest_arguments (drop the now-redundant inner
  tests/ segment), docker_command_utils mounts (the
  helm-tests mount is gone; chart/ was already mounted),
  selective_checks regexes
  (HELM_FILES, ALL_HELM_TESTS_PYTHON_FILES, ALL_SOURCE_FILES).
• scripts/ci/docker-compose/local.yml: drop the redundant
  helm-tests bind mount.
• scripts/ci/prek/run_mypy_full_dist_local_venv_or_breeze_in_ci.py:
  _TOP_LEVEL_ALLOWED_FOLDERS swap and a
  FOLDER_TO_PROJECT["chart/tests"] = "chart" override since
  chart/tests is not its own uv project — it lives inside the
  chart workspace member.
• dev/ide_setup/setup_idea.py: module list.
• Root .pre-commit-config.yaml: two test-file path exclusions.
• Docs in contributing-docs/testing/helm_unit_tests.rst and
  dev/breeze/doc/ci/04_selective_checks.md.
• Existing breeze unit tests in dev/breeze/tests/test_*.py updated
  to assert the new paths.
• Regenerated uv.lock (workspace-member rename
  apache-airflow-helm-tests → apache-airflow-helm-chart).

Follow-up: tighten chart packaging + add a CI guard (commit 910a4762e6)

Building the chart with
breeze release-management prepare-helm-chart-package after the move
revealed that the published chart .tgz had been bundling four files
that chart consumers do not need:

• pyproject.toml (workspace-member metadata for the chart's pytest
  / mypy config — irrelevant to consumers)
• .pre-commit-config.yaml (local dev/CI hook config)
• docs/ (chart documentation source — already rendered to
  airflow.apache.org/docs/helm-chart/, no need to ship inside the .tgz)
• newsfragments/ (towncrier source for building RELEASE_NOTES.rst
  at release time)

All four are now in chart/.helmignore, so the packaged set drops
from 19 → 16 top-level entries. To keep this from drifting again:

• New script
  scripts/ci/verify_helm_chart_package.py
  reads a packaged .tgz, asserts the top-level entries match an
  explicit allowlist, and runs helm lint against the same archive.
  Any newly-introduced top-level file fails the check until it is
  either added to the allowlist (chart-relevant) or to
  .helmignore (dev-only). Runnable locally:

  uv run scripts/ci/verify_helm_chart_package.py dist/airflow-1.22.0.tgz

• The verifier is wired into the existing tests-helm-release job
  in .github/workflows/helm-tests.yml, right after
  prepare-helm-chart-package produces the artifact and before
  signing — a regression in the packaged set fails CI immediately.

Caveat for local devs

Developers running breeze via uvx --from dev/breeze (the standard
ADR-0017 shim) may need a one-time uv cache clean (or just
touch dev/breeze/pyproject.toml) after pulling this commit so uvx
rebuilds breeze from the current source. uvx caches by content hash
and will otherwise serve a stale breeze that still references the old
helm-tests/tests/helm_tests path. CI runs aren't affected (each job
gets a fresh uv cache).

Test plan

• prek run --all-files passes (only the unrelated FAB pnpm
  ENAMETOOLONG issue from this worktree's nested path remains).
• Run mypy for helm-tests (the mypy-helm-tests hook on
  chart/.pre-commit-config.yaml) passes against chart/tests/.
• Lint Helm Chart, Kubeconform, Validate chart annotations
  and the chart schema/yaml hooks all pass.
• uv run --project dev/breeze pytest dev/breeze/tests/test_pytest_args_for_test_types.py dev/breeze/tests/test_selective_checks.py — 194 passed.
• breeze release-management prepare-helm-chart-package builds a
  280 KB airflow-1.22.0.tgz whose 16 top-level entries match
  the verifier's allowlist; helm lint passes.
• uv run scripts/ci/verify_helm_chart_package.py dist/airflow-1.22.0.tgz
  reports top-level contents: OK / helm lint: OK.
• CI Helm tests job runs against the new path on this PR.
• CI Static checks job stays green.

Was generative AI tooling used to co-author this PR?

• Yes — Claude Code (Opus 4.7)

Generated-by: Claude Code (Opus 4.7) following the guidelines