ci: point the slow-test matrix at tests/integration

[AlexanderFengler]

Purpose

The weekly drift run's slow suite has been failing every leg since the
2026-08-24 scheduled run. Six of the nine legs never collected a single test:

ERROR: file or directory not found: tests/slow/test_mcmc.py
ERROR: file or directory not found: tests/slow/test_missing_data_mcmc.py

85f2f032 ("moved all slow tests to integration folder") relocated every slow
test to tests/integration/ and landed on main on 2026-08-17 15:02 — after
that morning's green drift run, which is why 2026-08-24 was the first run to
see it. run_slow_tests.yml was not updated with it.

Implementation

• Repoint the Missing Data and Core MCMC batches at tests/integration/.
• Repoint the four --ignore= paths in the Remaining Slow batch. These were
  not merely cosmetic: a non-matching --ignore is silently accepted by
  pytest, so Remaining Slow had been re-collecting the Core MCMC and Missing
  Data files that the dedicated batches already own.
• Refresh the one stale tests/slow/ mention in the tests/conftest.py
  docstring for _slow_test_memory.

No test code or markers changed — only the paths naming it.

Verification

Each of the four referenced files was confirmed to exist at its new
tests/integration/ path on main; tests/slow/ no longer exists in the
tree. Beyond that this change is verified by its own CI: the slow suite is the
thing under repair, so this PR's run is the test.

Out of scope

The Remaining Slow legs fail for an unrelated, genuine reason —
tests/test_hssm.py::test_transform_params_general[include4-IndexError] now
raises KeyError: 'invalid_formula' instead of IndexError. That is a
behaviour change, tracked separately; this PR is expected to fix the six
collection-error legs only.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Tests
  • Updated slow-test workflow batches to use the integration test suite.
  • Revised test documentation to reflect the current integration test location.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 89ab5d65-f5c7-4255-87b0-5544cda09df2

📥 Commits

Reviewing files that changed from the base of the PR and between 5e49914 and 7b9310c.

📒 Files selected for processing (2)

• .github/workflows/run_slow_tests.yml
• tests/conftest.py

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

The slow-test workflow now uses tests/integration/ for all three matrix batches. The _slow_test_memory fixture documentation uses the same path reference. No executable test behavior changed.

Changes

Slow-test path updates

Layer / File(s)	Summary
Update slow-test references .github/workflows/run_slow_tests.yml, tests/conftest.py	The workflow matrix and exclusion paths now reference tests/integration/. The fixture documentation now uses the updated path.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 7b931

This localized change updates slow-test paths and a related documentation reference; no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: digicosmos86, cpaniaguam

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: updating the CI slow-test matrix to use tests/integration paths.
Docstring Coverage	✅ Passed	Docstring check was indeterminate for this PR — some files could not be analyzed in time. Not blocking.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch drift/2026-08-24-slow-test-paths

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