Make threaded test state boundaries explicit (#260)

[lodyai]

Summary

• Rebase onto current origin/main retains the upstream queue-and-event
  selector-metrics isolation test.
• Type the fixed thread1 and thread2 allowlist result record at the
  behaviour-state boundary.
• Collect named worker futures on the main thread and document the worker's
  ownership boundary.

Closes #260

Validation

• make check-fmt
• make test
• make typecheck
• make lint
• coderabbit review --agent

References

• Issue #260
• PR #234
• Request comment
• Lody session

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR makes threaded test state boundaries explicit by returning worker results via futures instead of mutating shared state, ensuring clearer ownership of test data across threads while preserving existing concurrency semantics and isolation assertions.

File-Level Changes

Change	Details	Files
Use ThreadPoolExecutor and future return values to collect selector-metrics snapshots without shared dict mutation from worker threads.	Import concurrent.futures to support future-based threading in selector metrics tests. Change the worker function to return a metrics snapshot instead of writing into a shared dictionary. Execute the worker on a ThreadPoolExecutor and obtain the active-thread snapshot via future.result with a timeout. Construct the snapshots dictionary entirely on the main thread using the active snapshot returned from the future and a main-thread snapshot.	cuprum/unittests/test_tee_profile_worker_selector_metrics.py
Refactor context allowlist threaded test to collect per-thread results via futures, making thread results mapping owned and constructed on the main thread.	Change thread worker to accept only the program set and return allowlist checks instead of mutating a shared results dictionary. Submit worker calls to a ThreadPoolExecutor with per-thread program sets and track the logical thread names separately. Build the results dictionary on the main thread by iterating futures and their associated names, calling future.result to obtain each thread’s data. Assign the constructed results mapping to behaviour_state['thread_results'] after all futures complete.	tests/behaviour/test_context_hooks.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#260	Remove unguarded cross-thread mutation of shared dictionaries in threaded test helpers by introducing explicit synchronization/result-collection boundaries (e.g., futures or locks).	✅
#260	Apply the explicit state-boundary approach to selector-metrics snapshot collection so the worker thread does not write directly into the shared snapshots dictionary.	✅
#260	Preserve existing behaviour coverage and concurrency semantics for threaded allowlist isolation and selector-metrics thread locality, keeping tests deterministic and production behaviour unchanged.	✅

Possibly linked issues

• Make threaded test-helper state boundaries explicit #260: PR replaces cross-thread dictionary mutation with future-collected results in both helpers, exactly matching the issue’s requirements.

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Summary

• Collect threaded test-helper results through futures in the main thread.
• Preserve allowlist isolation and selector-metrics thread-locality assertions.
• Keep production concurrency behaviour unchanged.
• Restore inline-code exceptions in the generated spelling policy via typos.local.toml.
• Validation passed for focused tests, formatting, linting, type checking, and the full test suite.

Walkthrough

The threaded tests now collect worker results through futures instead of shared dictionary mutation. The selector-metrics test records thread-local snapshots explicitly. The typo checker now ignores inline backtick-delimited text.

Changes

Threaded test state boundaries

Layer / File(s)	Summary
Collect selector-metrics snapshots through futures cuprum/unittests/test_tee_profile_worker_selector_metrics.py	Use ThreadPoolExecutor to return the worker snapshot. Record the main-thread snapshot separately.
Return threaded allowlist results tests/behaviour/test_context_hooks.py	Return allowlist results from the worker and collect each future result into the mapping.

Typo checker configuration

Layer / File(s)	Summary
Ignore inline code in typo checks typos.local.toml	Match backtick-enclosed text in the typo checker ignore list.

Suggested labels: Issue

Suggested reviewers: leynos

Poem

Threads return what they have found,
No shared writes pass unchecked around.
Snapshots stay in their proper lane,
Backticks keep typos from the train.
Futures gather results bright—
Tests now share state just right.

🚥 Pre-merge checks | ✅ 18 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	The typos.local.toml change preserves inline-code spelling exceptions but is unrelated to the coding requirements in issue #260.	Move the typos.local.toml change to a separate pull request, or provide a linked issue that explicitly includes the spelling-policy requirement.
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (18 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes satisfy issue #260 by collecting worker results through futures and preserving the required isolation assertions.
Testing (Overall)	✅ Passed	Accept this change: the diff alters no production code; both affected scenarios collect future results and assert distinct allowlists or metrics, while the spelling renderer already tests ignore-pa...
User-Facing Documentation	✅ Passed	The PR diff changes only two test helpers and typos.local.toml; it introduces no user-facing functionality or behaviour that requires users-guide documentation.
Developer Documentation	✅ Passed	The diff changes two test helpers and a typos ignore pattern only; it adds no API, architectural design, build requirement, roadmap item, or execplan needing developer-guide documentation.
Module-Level Documentation	✅ Passed	Both changed Python modules retain clear module docstrings; the diff changes test logic, imports, and spelling configuration, not module documentation.
Testing (Unit And Behavioural)	✅ Passed	Mark PASS: the diff only refactors test state collection; unit assertions retain metrics invariants, and the BDD scenario exercises public context isolation through real thread executors.
Testing (Property / Proof)	✅ Passed	The PR diff changes only two test helpers and typos.local.toml; it adds no production invariant or lemma, and existing Hypothesis coverage remains for metric accumulation.
Testing (Compile-Time / Ui)	✅ Passed	The diff changes only Python test helpers and a TOML spelling pattern; it adds no Rust or TypeScript compile-time behaviour and no UI or structured output requiring a snapshot.
Unit Architecture	✅ Passed	Accept: the diff changes only test files and typos.local.toml; worker values cross futures, snapshots are collected on the main thread, and production APIs remain unchanged.
Domain Architecture	✅ Passed	Pass this check: the diff changes only test helpers and typos.local.toml; it introduces no domain or production logic and no adapter-boundary leak.
Observability	✅ Passed	Pass: the pull request changes only test helpers and a spelling-policy file; it introduces no production operational behaviour or new observability requirement.
Security And Privacy	✅ Passed	The diff only changes test-local future result collection and a backtick spelling pattern; scans found no secrets, credentials, trust-boundary checks, injection sinks, permissions, or sensitive-dat...
Performance And Resource Use	✅ Passed	The diff changes only test helpers and spelling config; executors cap workers at 1/2, result collections hold two entries, and no production hot path or unbounded growth is introduced.
Concurrency And State	✅ Passed	Pass: The diff returns worker values through futures, collects dictionaries only on the main thread, and uses a context-managed executor; isolation assertions remain.
Architectural Complexity And Maintainability	✅ Passed	Keep the change: the diff only refactors test-local worker result collection, reuses the existing standard-library executor pattern, and adds no dependencies, modules, or architectural layers.
Rust Compiler Lint Integrity	✅ Passed	The PR range changes only two Python test files and typos.local.toml; it changes no Rust files or Rust lint suppressions. This Rust check is inapplicable.
Title check	✅ Passed	Accept the title. It clearly describes the threaded test state-boundary changes and references issue #260, which the description identifies as the issue being fixed.
Description check	✅ Passed	Accept the description. It accurately describes the future-based result collection, state-ownership changes, preserved behaviour, validation, and link to issue #260.

Full details: Docstring Coverage

Explanation

Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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Inline comments:
In `@cuprum/unittests/test_tee_profile_worker_selector_metrics.py`:
- Around line 215-218: Replace the fixed-shape snapshots dictionary in
cuprum/unittests/test_tee_profile_worker_selector_metrics.py:215-218 with typed
locals or a typed record, preserving active_snapshot and
metrics_state.snapshot() access. At tests/behaviour/test_context_hooks.py:314,
type the thread1 and thread2 result record at the behaviour-state boundary using
named locals, a TypedDict, or a slots dataclass.

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📥 Commits

Reviewing files that changed from the base of the PR and between 1743496 and be042da.

📒 Files selected for processing (3)

• cuprum/unittests/test_tee_profile_worker_selector_metrics.py
• tests/behaviour/test_context_hooks.py
• typos.local.toml

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❌ Failed check (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

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🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -euo pipefail

echo '=== PR checks ==='
gh pr checks 301 --repo leynos/cuprum || true

echo
echo '=== Changed files and diff ==='
git diff --unified=40 origin/"$(gh pr view 301 --repo leynos/cuprum --json baseRefName --jq .baseRefName)"...HEAD -- \
  tests/behaviour/test_context_hooks.py \
  cuprum/unittests/test_tee_profile_worker_selector_metrics.py \
  typos.local.toml

echo
echo '=== Source outlines ==='
ast-grep outline tests/behaviour/test_context_hooks.py --items all --type function
ast-grep outline cuprum/unittests/test_tee_profile_worker_selector_metrics.py --items all --type function

echo
echo '=== Changed functions and nearby docstrings ==='
rg -n -A35 -B8 \
  '^\s*def (run_threaded_allowlist_checks|test_.*thread|test_metrics_are_thread_local)\s*\(' \
  tests/behaviour/test_context_hooks.py \
  cuprum/unittests/test_tee_profile_worker_selector_metrics.py || true

Length of output: 3851

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🏁 Script executed:

#!/bin/bash
set -euo pipefail

echo '=== PR metadata ==='
gh pr view 301 --repo leynos/cuprum \
  --json state,isDraft,baseRefName,headRefName,baseRefOid,headRefOid,updatedAt \
  --jq '.'

echo
echo '=== Server-side changed-file patches ==='
gh api --paginate \
  'repos/leynos/cuprum/pulls/301/files?per_page=100' \
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echo
echo '=== Function outlines at PR head ==='
ast-grep outline tests/behaviour/test_context_hooks.py --items all --type function
ast-grep outline cuprum/unittests/test_tee_profile_worker_selector_metrics.py --items all --type function

echo
echo '=== Current affected definitions ==='
rg -n -A45 -B5 \
  '^\s*def (run_threaded_allowlist_checks|test_metrics_are_thread_local)\s*\(' \
  tests/behaviour/test_context_hooks.py \
  cuprum/unittests/test_tee_profile_worker_selector_metrics.py || true

echo
echo '=== Documentation-coverage configuration ==='
fd -HI '.*(docstring|interrogate|coverage).*|pyproject\.toml|tox\.ini|setup\.cfg' . \
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Length of output: 19435

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@leynos Mark the Docstring Coverage warning as resolved.

The current check list for PR #301 contains no Docstring Coverage warning or failure. All completed checks pass.

The affected functions are documented, including the nested record_active_thread_metrics() helper in cuprum/unittests/test_tee_profile_worker_selector_metrics.py.

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