# Test Coverage

> Imported from everything-codex command test-coverage

- Skill: `materialofair/test-coverage` (Agent Skill)
- Install (CLI): `npx skillmds@latest add materialofair/test-coverage`
- Raw SKILL.md: https://api.skillmd.com/api/skills/materialofair/test-coverage/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML, Coding & Dev Tools
- Author: materialofair (https://skillmd.com/u/materialofair)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/materialofair/test-coverage

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# Test Coverage


## Native Subagent Protocol (Codex)

Codex supports native subagents. Delegate with `spawn_agent`, coordinate with `send_input`, collect via `wait_agent`, and clean up with `close_agent`.

Execution preference:
1. Use native subagents first for independent workstreams (parallel when possible).
2. Merge results in main thread and run final verification.
3. Fallback only when delegation is blocked: use the `[ANALYST]`/`[ARCHITECT]`/`[EXECUTOR]`/`[REVIEWER]` structure in a single response.

Minimal orchestration pattern:
```text
spawn_agent -> send_input (optional) -> wait_agent -> close_agent
```

Analyze test coverage and generate missing tests:

1. Run tests with coverage: npm test --coverage or pnpm test --coverage

2. Analyze coverage report (coverage/coverage-summary.json)

3. Identify files below 80% coverage threshold

4. For each under-covered file:
   - Analyze untested code paths
   - Generate unit tests for functions
   - Generate integration tests for APIs
   - Generate E2E tests for critical flows

5. Verify new tests pass

6. Show before/after coverage metrics

7. Ensure project reaches 80%+ overall coverage

Focus on:
- Happy path scenarios
- Error handling
- Edge cases (null, undefined, empty)
- Boundary conditions