test: mutation hardening cycle — 72.19% to 78.14% (+5.95pp)

[cmbays]

Summary

• Mutation score: 72.19% -> 78.14% (+5.95 percentage points)
• Added 5 test files to the mutation test group (vitest.test-groups.ts)
• Wrote targeted tests to kill 64+ surviving mutants across 5 hotspot files
• Zero new production code — all changes are test additions

Per-file improvements

File	Before	After	Delta
session-bridge.ts	74.68%	84.09%	+9.41pp
cooldown-session.ts	65.70%	74.88%	+9.18pp
execute.ts	69.21%	72.69%	+3.48pp
observability-aggregator.ts	96.43%	100.00%	+3.57pp
kata-agent (overall)	92.68%	95.12%	+2.44pp
workflow-runner.ts	83.91%	83.91%	+0.00pp

Key changes

1. vitest.test-groups.ts: Added unit and helper test files to mutation test group
2. session-bridge.unit.test.ts: 15 new tests targeting budget estimation, named kata stage resolution, prepareCycle dedup guards, formatDuration, readBridgeRunMeta null path, updateRunJson guards, completeCycle filter
3. cooldown-session.unit.test.ts: 8 new tests targeting diary guard, betDescription fallback, force defaults, observation collection, autoSync filtering, listJsonFiles filter
4. execute.test.ts: 10 new tests targeting plain-text context output, pipeline print content, gyo trim, cycle state filter, yolo flag, cycle completion plain-text, no-token output
5. workflow-runner.test.ts: 2 new tests for listRecentArtifacts non-json filtering and persistArtifact dir creation

Remaining survivors (diminishing returns)

• execute.ts: Mostly StringLiteral description mutations (~80 of 107)
• cooldown-session.ts: Catch-block logger.warn NoCoverage (19)
• session-bridge.ts: existsSync early-return guards (22)
• kata-agent-confidence-calculator.ts: 2 BooleanLiteral on recursive mkdir

Test plan

• npm run typecheck passes
• npm run lint passes
• npm test (unit + integration) — 3284+ tests pass
• npm run test:mutation — 78.14% (above 70% break threshold)

Summary by CodeRabbit

• Tests
  • Expanded test coverage for CLI command execution, cycle management, workflow execution, and session management
  • Added tests for plain-text output rendering, whitespace handling, artifact filtering, and edge case scenarios
  • Strengthened regression safeguards across core features

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Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

This PR adds extensive test coverage across multiple test files without modifying any production code or public APIs. Tests cover plain-text rendering, cycle management, artifact filtering, JSON file handling, and various edge cases in execute, cooldown-session, workflow-runner, and session-bridge features. Configuration file updated to include new test files in mutation testing.

Changes

Cohort / File(s)	Summary
Execute Command Tests src/cli/commands/execute.test.ts	Adds tests for plain-text rendering (cycle completion, context, pipeline stages), yolo flag behavior, next-subcommand resolution, cycle selection logic, whitespace handling, and non-JSON file filtering in kata listings.
Cooldown Session Tests src/features/cycle-management/cooldown-session.unit.test.ts	Adds comprehensive tests for bet outcome enrichment, run/prepare warnings, synthesis observation collection, bridge-run synchronization, JSON file filtering, and various edge cases around incomplete runs and diary writing.
Workflow Runner Tests src/features/execute/workflow-runner.test.ts	Adds tests for JSON artifact filtering in listRecentArtifacts and dynamic artifacts directory creation during persistArtifact operations.
Session Bridge Tests src/infrastructure/execution/session-bridge.unit.test.ts	Adds tests for budget estimation, cycle preparation deduplication, stage resolution, bridge metadata handling, cycle completion aggregation, and error/warning scenarios with missing or invalid files.
Test Configuration vitest.test-groups.ts	Updates mutationTestFiles export to include five new test file paths (execute.helpers.test.ts, cooldown-session unit and helpers tests, session-bridge unit and helpers tests).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• PR #91: Overlaps with test additions to execute.test.ts and WorkflowRunner artifact-listing/persisting behaviors.
• PR #383: Directly related through test coverage of execute helpers, execute orchestration, and cooldown-session functionality changes.
• PR #382: Shares focus on session-bridge cycle-completion logic and verification of cycle completion totals.

Poem

🐰 Tests bloom like carrots in spring's gentle light,
Each cycle, each bet, now covered just right,
From plaintext to JSON, from run to digest,
We hop through the assertions—each one's a zest! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main objective: a mutation testing hardening effort that increased coverage from 72.19% to 78.14%, with all changes being test additions across multiple files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

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