test(github): add cache hit tests for profile and repos

Author: shambavi2007

lib/github.test.ts

@@ -423,6 +423,66 @@ describe('GitHub API cache behavior', () => {
 
     expect(fetch).toHaveBeenCalledTimes(2);
   });
+
+  it('cache hit: second profile call uses cached value', async () => {
+    vi.mocked(fetch).mockResolvedValue(
+      mockResponse({
+        login: 'octocat',
+        name: 'The Octocat',
+      })
+    );
+
+    await fetchUserProfile('octocat');
+    await fetchUserProfile('octocat');
+
+    expect(fetch).toHaveBeenCalledTimes(1);
+  });
+
+  it('refresh bypass: bypassCache=true forces fresh profile fetch', async () => {
+    vi.mocked(fetch).mockImplementation(async () =>
+      mockResponse({
+        login: 'octocat',
+        name: 'The Octocat',
+      })
+    );
+
+    await fetchUserProfile('octocat');
+    await fetchUserProfile('octocat', { bypassCache: true });
+
+    expect(fetch).toHaveBeenCalledTimes(2);
+  });
+
+  it('cache hit: second repos call uses cached value', async () => {
+    vi.mocked(fetch).mockResolvedValue(
+      mockResponse([
+        {
+          stargazers_count: 1,
+          language: 'TypeScript',
+        },
+      ])
+    );
+
+    await fetchUserRepos('octocat');
+    await fetchUserRepos('octocat');
+
+    expect(fetch).toHaveBeenCalledTimes(1);
+  });
+
+  it('refresh bypass: bypassCache=true forces fresh repos fetch', async () => {
+    vi.mocked(fetch).mockImplementation(async () =>
+      mockResponse([
+        {
+          stargazers_count: 1,
+          language: 'TypeScript',
+        },
+      ])
+    );
+
+    await fetchUserRepos('octocat');
+    await fetchUserRepos('octocat', { bypassCache: true });
+
+    expect(fetch).toHaveBeenCalledTimes(2);
+  });
 });
 describe('generateAchievements', () => {
   it('marks contribution milestones correctly', () => {