Add CI workflow and tests for /api/generate

.github/workflows/test.yml

@@ -0,0 +1,33 @@
+name: Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Run Vitest with Coverage
+        run: npm test
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+            token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true 

__tests__/apiGenerate.test.ts

@@ -0,0 +1,70 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { POST } from '../src/app/api/generate/route';
+
+// Mock external libs
+vi.mock('@/lib/octokit', () => ({
+  getRepoData: vi.fn(async () => ({
+    description: 'Mock repo',
+    language: 'TypeScript',
+    license: { name: 'MIT' },
+  })),
+  getRepoContents: vi.fn(async () => [
+    { name: 'package.json' },
+    { name: 'README.md' },
+  ]),
+}));
+
+vi.mock('@/lib/gemini', () => ({
+  getGeminiModel: () => ({
+    generateContent: async () => ({
+      response: {
+        text: () => '# my-repo\n\nGenerated README',
+      },
+    }),
+  }),
+}));
+
+describe('POST /api/generate', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('returns generated markdown for a valid GitHub URL', async () => {
+    const req = new Request('http://localhost/api/generate', {
+      method: 'POST',
+      body: JSON.stringify({ url: 'https://github.com/example/my-repo' }),
+    });
+
+    const res = await POST(req);
+    const data = await res.json();
+
+    expect(res.status).toBe(200);
+    expect(data.markdown).toContain('# my-repo');
+  });
+
+  it('returns error for invalid JSON body', async () => {
+    const req = new Request('http://localhost/api/generate', {
+      method: 'POST',
+      body: 'not-json',
+    });
+
+    const res = await POST(req);
+    const data = await res.json();
+
+    expect(res.status).toBe(400);
+    expect(data.error).toBe('Invalid JSON body');
+  });
+
+  it('returns error for non-GitHub URL', async () => {
+    const req = new Request('http://localhost/api/generate', {
+      method: 'POST',
+      body: JSON.stringify({ url: 'https://gitlab.com/example/repo' }),
+    });
+
+    const res = await POST(req);
+    const data = await res.json();
+
+    expect(res.status).toBe(400);
+    expect(data.error).toBe('Only GitHub URLs are supported');
+  });
+});