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Drives test-driven development, generates tests for existing code, and reviews coverage quality. Use before implementing any behavior.
デフォルトでは、最初にソースを確認する Prompt が選択されています。直接コマンドに切り替えるか、ローカルコピーをダウンロードすることもできます。
インストールを決める前に、SKILL.md と SkillsMP に表示されている付属ファイルをお読みください。
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
直接コマンドでは確認用 Prompt が省略されます。実行前にソースを確認してください。
npx skills add https://github.com/fworks-tech/agenthood --skill test-driven-developmentコマンドは1行のまま表示されます。コピー前に横へスクロールして全体を確認してください。
ローカルで確認しますか？SkillsMP が現在取得できるファイルをダウンロードできます。
SOC 職業分類に基づく
SKILL.md を表示中
| name | test-driven-development |
| description | Drives test-driven development, generates tests for existing code, and reviews coverage quality. Use before implementing any behavior. |
| license | MIT |
The Tester's confidence comes from evidence, not intuition. It writes the test before the code. It treats a failing test as a specification. It does not celebrate coverage numbers — it celebrates tests that would actually catch a bug. There is a difference between code that is covered and code that is tested. The Tester knows it.
Red — Write a failing test first
Green — Write the minimum code to pass
Refactor — Clean up without breaking the test
Repeat for every new behavior.
Balance test types to maximize confidence per second of test run time:
/\
/ \ E2E — few, slow, cover critical user journeys only
/ \
/------\
/ \ Integration — cover module boundaries and data flows
/ \
/------------\
/ \ Unit — many, fast, cover all logic and edge cases
/________________\
it('returns null when user does not exist')expect(result).toEqual({ id: 1, name: 'Alice' })expect(mockDb.findOne).toHaveBeenCalledWith({ id: 1 })When a bug is found:
test: and fix: commitsThe regression test is the proof that the bug existed and proof that it was fixed.
Examine existing tests for:
| Quality Check | Good | Bad |
|---|---|---|
| Naming | 'returns 404 when user not found' | 'test user endpoint' |
| Assertion quality | Asserts on return value and side effects | Only asserts a function was called |
| Independence | Each test can run alone | Tests depend on execution order |
| Determinism | Same result every run | Flaky due to timing or external state |
| Scope | Tests one behavior | Tests five things in one it() block |
| Mocking | Mocks only external dependencies | Mocks the system under test |
'test1', 'should work', 'handles it'expect(fn).not.toThrow() with no other checks)| What you think | What The Tester knows |
|---|---|
| "I'll add tests later" | Later means never. The feature ships. The tests never arrive. |
| "The code is too simple to test" | The code that's too simple to test is exactly where the subtle bugs hide. |
| "We have 80% coverage, that's enough" | Coverage measures lines executed, not behaviors verified. 80% coverage on the wrong things is theater. |
| "TDD slows me down" | TDD slows you down for the first hour. It speeds you up for every hour after that. |
Before marking a task complete: