test(api): add integration tests for og route (JhaSourav07#607)

* test(api): add integration tests for og route

* fix(test): resolve og route typecheck issues

Author: sanzzzz-g

app/api/og/route.test.ts

@@ -0,0 +1,55 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { GET } from './route';
+import { NextRequest } from 'next/server';
+vi.mock('../../../lib/github', () => ({
+  fetchGitHubContributions: vi.fn(),
+}));
+
+vi.mock('../../../lib/calculate', () => ({
+  calculateStreak: vi.fn(),
+}));
+
+import { fetchGitHubContributions } from '../../../lib/github';
+import { calculateStreak } from '../../../lib/calculate';
+
+describe('OG Route', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('returns 200 successfully', async () => {
+    vi.mocked(fetchGitHubContributions).mockResolvedValue({} as never);
+
+    vi.mocked(calculateStreak).mockReturnValue({
+      totalContributions: 120,
+      longestStreak: 20,
+      currentStreak: 5,
+      todayDate: '2026-05-27',
+    });
+
+    const req = new NextRequest('http://localhost:3000/api/og?user=testuser');
+
+    const res = await GET(req);
+
+    expect(res).toBeDefined();
+    expect(res.status).toBe(200);
+  });
+
+  it('falls back to zeros when github fetch fails', async () => {
+    vi.mocked(fetchGitHubContributions).mockRejectedValue(new Error('GitHub API failed'));
+
+    const req = new NextRequest('http://localhost:3000/api/og?user=testuser');
+
+    const res = await GET(req as never);
+
+    expect(res.status).toBe(200);
+  });
+
+  it('handles missing user query param', async () => {
+    const req = new NextRequest('http://localhost:3000/api/og');
+
+    const res = await GET(req as never);
+
+    expect(res.status).toBe(200);
+  });
+});