test: add base path test case about create route manifest

Author: seoyeon9888

packages/nextjs/test/config/manifest/suites/base-path/app/about/page.tsx

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+// about page

packages/nextjs/test/config/manifest/suites/base-path/app/api/test/page.tsx

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+// API test page

packages/nextjs/test/config/manifest/suites/base-path/app/page.tsx

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+// root page

packages/nextjs/test/config/manifest/suites/base-path/app/users/[id]/page.tsx

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+// users id dynamic page

packages/nextjs/test/config/manifest/suites/base-path/base-path.test.ts

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+import path from 'path';
+import { describe, expect, test } from 'vitest';
+import { createRouteManifest } from '../../../../../src/config/manifest/createRouteManifest';
+
+describe('basePath', () => {
+  test('should generate routes with base path prefix', () => {
+    const manifest = createRouteManifest({
+      basePath: '/my-app',
+      appDirPath: path.join(__dirname, 'app')
+    });
+
+    expect(manifest).toEqual({
+      staticRoutes: [
+        { path: '/my-app' },
+        { path: '/my-app/about' },
+        { path: '/my-app/api/test' }
+      ],
+      dynamicRoutes: [
+        {
+          path: '/my-app/users/:id',
+          regex: '^/my-app/users/([^/]+)$',
+          paramNames: ['id'],
+        }
+      ],
+    });
+  });
+
+  test('should validate dynamic route regex with base path', () => {
+    const manifest = createRouteManifest({
+      basePath: '/my-app',
+      appDirPath: path.join(__dirname, 'app')
+    });
+
+    const dynamicRoute = manifest.dynamicRoutes.find(route => route.path === '/my-app/users/:id');
+    const regex = new RegExp(dynamicRoute?.regex ?? '');
+
+    // Should match valid paths with base path
+    expect(regex.test('/my-app/users/123')).toBe(true);
+    expect(regex.test('/my-app/users/john-doe')).toBe(true);
+
+    // Should not match paths without base path
+    expect(regex.test('/users/123')).toBe(false);
+
+    // Should not match invalid paths
+    expect(regex.test('/my-app/users/')).toBe(false);
+    expect(regex.test('/my-app/users/123/extra')).toBe(false);
+    expect(regex.test('/my-app/user/123')).toBe(false);
+  });
+});