🧪 Add error handling test for loadCardSettings#346
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🎯 What: The testing gap addressed The loadCardSettings function uses a standard try-catch block around window.localStorage accesses and JSON.parse. While safeParse handled invalid JSON, the tests did not explicitly verify that if accessing window.localStorage.getItem itself throws an error (e.g., due to user privacy settings or security policies), the function gracefully catches the exception and returns the default fallback layout and options instead of crashing the page. 📊 Coverage: What scenarios are now tested A new test explicitly mocks window.localStorage.getItem to throw an Error and asserts that loadCardSettings() catches it safely. ✨ Result: The improvement in test coverage src/lib/cardSettings.ts coverage has reached 100% across statements, lines, branches, and functions. Co-authored-by: is0692vs <135803462+is0692vs@users.noreply.github.com>
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Code Review
This pull request adds a unit test to verify that loadCardSettings gracefully handles exceptions and returns default values when localStorage access is denied. The review feedback suggests adding an explicit never return type to the mock implementation that throws the error to maintain type safety.
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| getItemMock.mockImplementation(() => { | ||
| throw new Error('Access to localStorage is denied'); | ||
| }); |
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To maintain type safety and adhere to the project's guidelines, mock implementations should have explicit return types. Since this mock function always throws an error, please add an explicit never return type.
| getItemMock.mockImplementation(() => { | |
| throw new Error('Access to localStorage is denied'); | |
| }); | |
| getItemMock.mockImplementation((): never => { | |
| throw new Error('Access to localStorage is denied'); | |
| }); |
References
- In TypeScript, ensure functions and mock implementations have explicit return types and use async functions for mocks returning Promises to maintain type safety and readability.
Codecov Report✅ All modified and coverable lines are covered by tests. 📢 Thoughts on this report? Let us know! |
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| // The function should gracefully handle the exception and return defaults | ||
| const result = loadCardSettings(); | ||
|
|
||
| expect(result.layout).toEqual(DEFAULT_CARD_LAYOUT); | ||
| expect(result.options.showCompany).toBe(true); | ||
| expect(result.options.showTwitter).toBe(true); | ||
| }); |
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getItemMock が実際に呼び出されたことを確認するアサーションを追加することを検討してください。このアサーションが無いと、もし将来的に実装が localStorage を呼び出す前に何らかの理由でガード節へ飛んでしまっても、テストはグリーンのままになり得ます。
| // The function should gracefully handle the exception and return defaults | |
| const result = loadCardSettings(); | |
| expect(result.layout).toEqual(DEFAULT_CARD_LAYOUT); | |
| expect(result.options.showCompany).toBe(true); | |
| expect(result.options.showTwitter).toBe(true); | |
| }); | |
| // The function should gracefully handle the exception and return defaults | |
| const result = loadCardSettings(); | |
| expect(getItemMock).toHaveBeenCalled(); | |
| expect(result.layout).toEqual(DEFAULT_CARD_LAYOUT); | |
| expect(result.options.showCompany).toBe(true); | |
| expect(result.options.showTwitter).toBe(true); | |
| }); |
Prompt To Fix With AI
This is a comment left during a code review.
Path: src/lib/__tests__/cardSettings.test.ts
Line: 112-118
Comment:
テストの目的（「localStorage アクセスが例外をスロー**する**ときにデフォルトを返す」）を完全に証明するために、`getItemMock` が実際に呼び出されたことを確認するアサーションを追加することを検討してください。このアサーションが無いと、もし将来的に実装が `localStorage` を呼び出す前に何らかの理由でガード節へ飛んでしまっても、テストはグリーンのままになり得ます。
```suggestion
// The function should gracefully handle the exception and return defaults
const result = loadCardSettings();
expect(getItemMock).toHaveBeenCalled();
expect(result.layout).toEqual(DEFAULT_CARD_LAYOUT);
expect(result.options.showCompany).toBe(true);
expect(result.options.showTwitter).toBe(true);
});
```
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!
1 participant
🎯 What: The testing gap addressed
The
loadCardSettingsfunction uses a standardtry-catchblock aroundwindow.localStorageaccesses andJSON.parse. WhilesafeParsehandled invalid JSON, the tests did not explicitly verify that if accessingwindow.localStorage.getItemitself throws an error (e.g., due to user privacy settings or security policies), the function gracefully catches the exception and returns the default fallback layout and options instead of crashing the page.📊 Coverage: What scenarios are now tested
A new test explicitly mocks
window.localStorage.getItemto throw an Error and asserts thatloadCardSettings()catches it safely.✨ Result: The improvement in test coverage
src/lib/cardSettings.tscoverage has reached 100% across statements, lines, branches, and functions.PR created automatically by Jules for task 8563509317614795651 started by @is0692vs
Greptile Summary
このPRは
loadCardSettings関数においてwindow.localStorage.getItemが例外をスローした場合にデフォルト値が返されることを確認するテストケースを1件追加します。getItemMock.mockImplementationでエラーをスローするよう設定し、loadCardSettings()がクラッシュせずにデフォルトのlayoutとoptionsを返すことをアサートする新規テストを追加。cardSettings.ts) には変更なし。Confidence Score: 5/5
テストファイルのみの変更でソースコードに影響はなく、マージしても安全です。
変更はテストケース1件の追加のみで、cardSettings.ts 本体には触れていません。新テストのロジックは正確で、実際のソースコードの catch ブロックが返す値と一致するアサーションになっています。軽微な改善点（モック呼び出しの検証）はありますが、既存テストや動作への影響はありません。
特に注意が必要なファイルはありません。
Important Files Changed
Flowchart
%%{init: {'theme': 'neutral'}}%% flowchart TD A[loadCardSettings 呼び出し] --> B{window が定義されているか?} B -- No --> C[デフォルト値を返す] B -- Yes --> D[try ブロック開始] D --> E[localStorage.getItem LAYOUT_KEY] E -- 例外スロー --> F[catch ブロック] F --> C E -- 正常 --> G[localStorage.getItem OPTIONS_KEY] G -- 例外スロー --> F G -- 正常 --> H[safeParse でパース] H --> I[normalizeCardLayout & mergeOptions] I --> J[パース済み設定を返す]Prompt To Fix All With AI
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