Test Review Skill

Trigger

• Keywords: test coverage, test review, are tests sufficient, generate tests, test gen, coverage

When NOT to Use

• Code review (use codex-code-review)
• Document review (use doc-review)
• Just want to run tests (use /verify)

Commands

Command	Description	Use Case
/codex-test-review	Review test sufficiency	Required
/codex-test-gen	Generate unit tests	Add missing tests
/check-coverage	Test coverage analysis	After feature dev

Workflow: /codex-test-review

Smart detect target → Read test + source → Codex review (5 dimensions) → Coverage assessment + Gate → Loop if Needs additions

Step 1: Smart Detection

Input	Behavior
File path	Review that file directly
Directory	Review all tests in directory
Description	Auto-find related test files
Module name	Search related test files
No parameter	Auto-detect from git diff

Step 2: Read Test and Source

• Read test file (TEST_FILE)
• Read corresponding source (SOURCE_FILE, inferred from test path)

Step 3: Codex Review

First review: mcp__codex__codex with test review prompt. See references/codex-prompt-test-review.md.

Loop review: mcp__codex__codex-reply with re-review template. See references/codex-prompt-test-review.md.

Config: sandbox: 'read-only', approval-policy: 'never'

Save the returned threadId.

Workflow: /codex-test-review --ac-trace

AC traceability mode — maps Acceptance Criteria from request docs to test evidence.

--ac-trace input → Read request doc → Parse ACs → Filter quality-gate → Search evidence → Codex verify → Matrix + Gate

Step 1: Input Resolution

Input	Behavior
--ac-trace <request-path>	Read specified request doc
--ac-trace (no path)	Auto-detect from docs/features/*/requests/*.md via git diff context
No --ac-trace	Existing behavior (5-dimension coverage review)

Step 2: Parse & Filter ACs

1. Locate ## Acceptance Criteria section in request doc
2. Parse - [ ] / - [x] items
3. Filter out quality-gate ACs matching: /codex-review-fast, /codex-review-doc, /codex-review, /precommit, /precommit-fast, /pr-review

Step 3: Search Evidence

For each non-quality-gate AC:

Evidence Type	Priority	How to Find
Automated test	1 (preferred)	Search Related Files test paths; match AC text → test assertions
Runtime verification	2	Search /feature-verify results at L3+ confidence
Manual exception	3 (verified only)	Check AC annotation <!-- exception: REASON, expires: DATE -->

Step 4: Codex Verify (independent)

Fresh thread (mcp__codex__codex). See references/codex-prompt-ac-trace.md.

Rule	Detail
Cache	request-path + git diff hash key; same session reuse
Timeout	30s → fallback to Claude-only + ⚠️ Inconclusive
Unavailable	All items ⚠️ Inconclusive; advisory → ⚠️ Adequate with exceptions; strict → ⚠️ Need Human

Config: sandbox: 'read-only', approval-policy: 'never'

Save the returned threadId.

Step 5: Exception Validation (3-gate)

Gate	Check
Reason class	Closed enum: ENV_UNAVAILABLE / UNSAFE_TO_AUTOMATE / ONE_TIME_MIGRATION
Codex verification	Must emit VALID_EXCEPTION
Expiry	ISO 8601; expired = ⛔ (strict) or ⚠️ (advisory)

Exception caps (from @rules/testing.md): 1-8 AC = max 1; 9-12 = max 2; 13+ = hard cap 2. Prohibited domains: Security AC, Data-integrity AC, Regression AC = no exceptions allowed.

Step 6: Output + Gate

Gate sentinels (from @rules/testing.md):

Sentinel	Meaning
✅ Adequate	All ACs covered by evidence
⚠️ Adequate with exceptions	Validated exceptions within cap
⚠️ Need Human	Codex unavailable or inconclusive
⛔ Inadequate	Unverified exception, cap breach, or prohibited domain

Workflow: /codex-test-gen

Read source → Derive test path → Codex generate → Save test file → Suggest review

Steps

1. Read source file
2. Derive test path: src/service/xxx.ts → test/unit/service/xxx.test.ts
3. Codex generates tests. See references/codex-prompt-test-gen.md.
4. Save to target path
5. Suggest: run tests then /codex-test-review

Review Dimensions

Dimension	Scoring Criteria	Weight
Happy path	All public methods, main flows	High
Error handling	try/catch, error callbacks	High
Edge cases	null/undefined, extremes, empty sets	Medium
Mock quality	Not excessive, not insufficient	Medium

Three-Layer Tests

Type	Directory	Mock	Focus
Unit	test/unit/	Full	Single function
Integration	test/integration/	Only external	Inter-module
E2E	test/e2e/	Prohibited	Complete flow

Common Boundaries

Type	Cases
String	"", " ", null, undefined, very long
Number	0, -1, NaN, Infinity, MAX_SAFE_INTEGER
Array	[], [null], very large, nested
Object	{}, null, circular reference

Review Loop

⚠️ @CLAUDE.md auto-loop: fix → re-review → ... → ✅ PASS ⚠️

⛔ Needs additions → add tests → /codex-test-review --continue <threadId> → repeat until ✅ Sufficient.

Max 3 rounds. Still failing → report blocker.

Output

## Test Coverage Review
| Dimension | Coverage | Rating |
|-----------|----------|--------|
| ...       | ...      | ⭐1-5  |

### Gate: ✅ Tests sufficient / ⛔ Needs additions

Verification

• Coverage assessment includes all dimensions
• Gate is clear (✅ Tests sufficient / ⛔ Needs additions)
• Missing tests have specific code suggestions
• Codex independently researched source code branches

References

• Test review prompt: references/codex-prompt-test-review.md
• Test gen prompt: references/codex-prompt-test-gen.md
• AC trace prompt: references/codex-prompt-ac-trace.md
• Standards: @rules/testing.md

Examples

Input: /codex-test-review test/unit/service/xxx.test.ts
Action: Read test + source → Codex review → Coverage assessment + Gate

Input: /codex-test-gen src/service/xxx.ts
Action: Read source → Codex generate → Save test → Suggest review

Input: Are this service's tests sufficient?
Action: /codex-test-review → Assess coverage → Output gaps + Gate

Input: /codex-test-review --ac-trace docs/features/auth/requests/2026-03-01-login.md
Action: Parse AC → Filter quality-gate → Search evidence → Codex verify → Matrix + Gate