🧪 Add tests for Header component

[is0692vs]

🎯 What: Missing Test File for Header Component
📊 Coverage: Covered rendering, navigation links, and isActive routing logic, including subpath matches and root path active logic. Mocks were created for next/navigation and the LoginButton.
✨ Result: Improved test coverage and ensured correct routing and class logic for the Header component.

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PR created automatically by Jules for task 7163336045725459314 started by @is0692vs

Greptile Summary

Header コンポーネントの欠損テストファイルを追加するPRです。レンダリング確認、ナビゲーションリンク、isActive のルーティングロジック（完全一致・サブパス一致・ルートパス除外）をカバーしています。

全体的な実装は正確で、既存のテストパターン（// @vitest-environment jsdom + @testing-library/jest-dom インポート）にも準拠しています。

Confidence Score: 5/5

テストのみの変更でありマージ可能。指摘はすべてP2の改善提案です。

既存の実装ロジックと一致したテストが追加されており、バグや誤ったアサーションはありません。残課題はルートパスのアクティブ状態が未検証という網羅性の問題（P2）のみで、マージをブロックするものではありません。

src/components/tests/Header.test.tsx — "/" パス時のアクティブ状態テストを追加するとカバレッジが向上します。

Important Files Changed

Filename	Overview
src/components/tests/Header.test.tsx	Header コンポーネントのテストを新規追加。レンダリング・ナビリンク・isActive ロジックをカバーしているが、pathname === "/" でホームがアクティブになるケースが未検証。

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[テスト開始] --> B[mockUsePathname をセット]
    B --> C[Header をレンダリング]
    C --> D{テストケース}

    D --> E["renders correctly\npathname='/'"]
    D --> F["renders navigation links\npathname='/'"]
    D --> G["exact match\npathname='/dashboard'"]
    D --> H["subpath match\npathname='/dashboard/year'"]
    D --> I["root path logic\npathname='/some-other-path'"]

    G --> G1["Dashboard → text-accent ✓\nHome → text-muted ✓"]
    H --> H1["Year in Review → text-accent ✓\nDashboard → text-accent ✓\n（startsWith '/dashboard/'）"]
    I --> I1["Home → text-muted ✓\nHome → not text-accent ✓"]
    E --> E1["'GitHub User Summary' 表示確認 ✓\nlogin-button 表示確認 ✓\n⚠️ Home のアクティブ状態 未検証"]
    F --> F1["5つのナビリンク存在確認 ✓"]

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Prompt To Fix All With AI

This is a comment left during a code review.
Path: src/components/__tests__/Header.test.tsx
Line: 17-24

Comment:
**"/" パスのアクティブ状態が未検証**

PR説明では「root path active logic を網羅した」とありますが、`pathname === "/"` のときに Home リンクが `text-accent` クラスを持つケースがテストされていません。`renders correctly` テストは `pathname = "/"` を使っているにもかかわらず、アクティブクラスの確認をしていないため、`isActive("/", "/")` の正常系が抜けています。

```suggestion
  it("renders correctly", () => {
    mockUsePathname.mockReturnValue("/");
    render(<Header />);
    expect(screen.getByText("GitHub User Summary")).toBeInTheDocument();
    expect(screen.getByTestId("login-button")).toBeInTheDocument();
    // ルートパスでは Home がアクティブになることを確認
    expect(screen.getByRole("link", { name: "Home" })).toHaveClass("text-accent");
  });
```

How can I resolve this? If you propose a fix, please make it concise.

---

This is a comment left during a code review.
Path: src/components/__tests__/Header.test.tsx
Line: 40-46

Comment:
**"exact match" テストでの非アクティブ確認が不完全**

`homeLink` が `text-muted` を持つことは確認していますが、`text-accent` を持たないことを明示的に検証していません。テスト5（"handles root path"）では両方チェックしているのに、こちらは片方のみで一貫性がありません。`text-muted` と `text-accent` はコンポーネント上は排他ですが、テストとしての明示性が低いです。

```suggestion
    expect(dashboardLink).toHaveClass("text-accent");
    expect(homeLink).toHaveClass("text-muted");
    expect(homeLink).not.toHaveClass("text-accent");
```

How can I resolve this? If you propose a fix, please make it concise.

_{Reviews (1): Last reviewed commit: "🧪 Add tests for Header component" | Re-trigger Greptile}

Greptile also left 2 inline comments on this PR.

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Project	Deployment	Actions	Updated (UTC)
github-user-summary	Ready	Preview, Comment	Apr 17, 2026 8:38am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 556b1c08-abbe-40b2-a72d-5946f06e7fa4

📥 Commits

Reviewing files that changed from the base of the PR and between 3be157d and 2d8e929.

📒 Files selected for processing (1)

• src/components/__tests__/Header.test.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-header-tests-7163336045725459314

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[gemini-code-assist]

Code Review

This pull request introduces unit tests for the Header component using Vitest and React Testing Library. The tests cover basic rendering, navigation link presence, and active link highlighting logic for both exact and subpath matches. Feedback includes suggestions to verify the href attributes of navigation links and the logo, as well as adding a test case to handle scenarios where usePathname returns null to prevent potential runtime errors.

[is0692vs]

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