🧪 [Add retry behavior tests for usePlaylistDetail]#950
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Co-authored-by: is0692vs <135803462+is0692vs@users.noreply.github.com>
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| describe("usePlaylistDetail retry behavior", () => { | ||
| it("should retry on network errors and eventually succeed", async () => { | ||
| const playlistId = "playlist123"; | ||
| const mockData = { id: playlistId, name: "Retry Success Detail" }; | ||
| (global.fetch as jest.Mock) | ||
| .mockRejectedValueOnce(new Error("fetch failed with ECONNRESET")) | ||
| .mockResolvedValueOnce({ | ||
| ok: true, | ||
| json: async () => mockData, | ||
| }); | ||
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| const { result } = renderHook(() => usePlaylistDetail(playlistId), { wrapper }); | ||
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| await waitFor(() => expect(result.current.isSuccess).toBe(true), { | ||
| timeout: 3000, | ||
| }); | ||
| expect(result.current.data).toEqual(mockData); | ||
| expect(global.fetch).toHaveBeenCalledTimes(2); | ||
| expect(global.fetch).toHaveBeenCalledWith(`/api/playlists/${playlistId}`); | ||
| }); | ||
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| it("should throw error immediately for non-network errors", async () => { | ||
| const playlistId = "playlist123"; | ||
| (global.fetch as jest.Mock).mockRejectedValueOnce( | ||
| new Error("Some other error"), | ||
| ); | ||
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| const { result } = renderHook(() => usePlaylistDetail(playlistId), { wrapper }); | ||
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| await waitFor(() => expect(result.current.isError).toBe(true)); | ||
| expect(result.current.error).toBeDefined(); | ||
| expect(global.fetch).toHaveBeenCalledTimes(1); | ||
| }); | ||
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| it("should fail after max retries for network errors", async () => { | ||
| const playlistId = "playlist123"; | ||
| (global.fetch as jest.Mock).mockRejectedValue( | ||
| new Error("fetch failed with ECONNRESET"), | ||
| ); | ||
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| const { result } = renderHook(() => usePlaylistDetail(playlistId), { wrapper }); | ||
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| await waitFor(() => expect(result.current.isError).toBe(true), { timeout: 4000 }); | ||
| expect(global.fetch).toHaveBeenCalledTimes(3); | ||
| expect(result.current.error).toBeDefined(); | ||
| }); | ||
| }); |
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retryFetch は delay: number = 1000 (デフォルト 1000ms) で setTimeout を使用するため、新規追加の 3 テストは実際に 1〜2 秒待機します。timeout: 3000 / timeout: 4000 はギリギリ足りますが、CI 環境が重い場合にフレーキーになるリスクがあります。
jest.useFakeTimers() と jest.runAllTimersAsync() を組み合わせることで、テストを高速・決定論的にできます。
Prompt To Fix With AI
This is a comment left during a code review.
Path: packages/web-app-vercel/lib/hooks/__tests__/usePlaylists.test.tsx
Line: 131-177
Comment:
**フェイクタイマー未使用によるテスト速度の問題**
`retryFetch` は `delay: number = 1000` (デフォルト 1000ms) で `setTimeout` を使用するため、新規追加の 3 テストは実際に 1〜2 秒待機します。`timeout: 3000` / `timeout: 4000` はギリギリ足りますが、CI 環境が重い場合にフレーキーになるリスクがあります。
`jest.useFakeTimers()` と `jest.runAllTimersAsync()` を組み合わせることで、テストを高速・決定論的にできます。
How can I resolve this? If you propose a fix, please make it concise.Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!
| it("should fail after max retries for network errors", async () => { | ||
| const playlistId = "playlist123"; | ||
| (global.fetch as jest.Mock).mockRejectedValue( | ||
| new Error("fetch failed with ECONNRESET"), | ||
| ); | ||
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| const { result } = renderHook(() => usePlaylistDetail(playlistId), { wrapper }); | ||
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| await waitFor(() => expect(result.current.isError).toBe(true), { timeout: 4000 }); | ||
| expect(global.fetch).toHaveBeenCalledTimes(3); | ||
| expect(result.current.error).toBeDefined(); | ||
| }); |
There was a problem hiding this comment.
mockRejectedValue による永続的なモック汚染の可能性
mockRejectedValue（Once なし）を使用すると、beforeEach の jest.clearAllMocks() では実装がリセットされないため、後続テストにフォールバック動作として残ります。現状は後続テストがすべて mockResolvedValueOnce / mockRejectedValueOnce を使っているためたまたま動作していますが、テスト追加時に気づきにくいバグの原因になり得ます。beforeEach を jest.resetAllMocks() に変更することを検討してください。
Prompt To Fix With AI
This is a comment left during a code review.
Path: packages/web-app-vercel/lib/hooks/__tests__/usePlaylists.test.tsx
Line: 165-176
Comment:
**`mockRejectedValue` による永続的なモック汚染の可能性**
`mockRejectedValue`（`Once` なし）を使用すると、`beforeEach` の `jest.clearAllMocks()` では実装がリセットされないため、後続テストにフォールバック動作として残ります。現状は後続テストがすべて `mockResolvedValueOnce` / `mockRejectedValueOnce` を使っているためたまたま動作していますが、テスト追加時に気づきにくいバグの原因になり得ます。`beforeEach` を `jest.resetAllMocks()` に変更することを検討してください。
How can I resolve this? If you propose a fix, please make it concise.1 participant
🎯 What: The testing gap addressed
The
usePlaylistDetailhook insidepackages/web-app-vercel/lib/hooks/usePlaylists.tswas lacking test coverage for its retry behavior (which uses theretryFetchutility). This PR adds the missing tests to ensure the retry logic handles transient network failures correctly.📊 Coverage: What scenarios are now tested
usePlaylistDetailsuccessfully retrying on network errors (ECONNRESET) and eventually returning the data.usePlaylistDetailcorrectly failing fast without retrying for non-network errors.usePlaylistDetailfailing and surfacing an error if network errors persist up to the maximum retry count.✨ Result: The improvement in test coverage
Increased robustness and test coverage of the application's network data fetching layer, guaranteeing that playlist fetching handles flakey networks properly without silent regressions.
PR created automatically by Jules for task 2757039974791365377 started by @is0692vs
Greptile Summary
usePlaylistDetailフックのリトライ動作（retryFetchユーティリティ使用）に対するテストカバレッジを追加するPRです。既存のusePlaylistsリトライテストと対称的な構造で、3つのシナリオをカバーしています。ECONNRESET）発生後にリトライして成功するケースConfidence Score: 4/5
テストのみの変更で本番コードへの影響はなく、マージは安全です。
テストロジック（呼び出し回数・エラー条件・成功条件）は
retryFetchの実装と正確に対応しており、意図した動作を正しく検証しています。ただし実タイマー依存による速度とフレーキーリスク、およびmockRejectedValueの永続的な実装残留という2点が改善余地として残ります。usePlaylists.test.tsxのみ変更対象。実タイマーとjest.clearAllMocks()の組み合わせについて確認が望ましいです。Important Files Changed
usePlaylistDetailのリトライ動作に関する 3 つのテストを追加。実タイマーへの依存とモック実装の残留リスクはあるが、テストのロジック自体は正確。Prompt To Fix All With AI
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