test: add auth routes integration tests

Made-with: Cursor

tests/helpers/build-test-app.ts

@@ -0,0 +1,46 @@
+import Fastify, { FastifyInstance } from 'fastify';
+import { AppError } from '../../src/utils/errors.js';
+import { authRoutes } from '../../src/routes/auth.js';
+import type { MockDb } from '../test-utils.js';
+import { createMockDb } from '../test-utils.js';
+
+/**
+ * Build a minimal Fastify app for auth route integration tests.
+ * Uses mock db and rate limit options (no actual rate limiting).
+ */
+export async function buildAuthTestApp(mockDb?: MockDb): Promise<FastifyInstance> {
+  const db = mockDb ?? createMockDb();
+
+  const app = Fastify({
+    logger: false,
+    requestIdHeader: 'x-request-id',
+    requestIdLogLabel: 'requestId',
+  });
+
+  app.setErrorHandler((err: unknown, request, reply) => {
+    const error = err as Error & { statusCode?: number; validation?: unknown };
+    if (err instanceof AppError) {
+      return reply.status(err.statusCode).send(err.toJSON());
+    }
+    if (error.validation) {
+      return reply.status(422).send({
+        error: { code: 'VALIDATION_ERROR', message: 'Validation failed', details: error.validation },
+      });
+    }
+    return reply.status(500).send({ error: { code: 'INTERNAL_ERROR', message: error.message } });
+  });
+
+  app.decorate('db', db);
+  app.decorate('rateLimitOptions', {
+    login: { max: 100, timeWindow: '1 minute' },
+    register: { max: 100, timeWindow: '1 hour' },
+    forgotPassword: { max: 100, timeWindow: '1 hour' },
+    verifyEmail: { max: 100, timeWindow: '15 minutes' },
+    apiAuthed: { max: 100, timeWindow: '1 minute' },
+    apiGuest: { max: 100, timeWindow: '1 minute' },
+  });
+
+  await app.register(authRoutes, { prefix: '/auth' });
+
+  return app;
+}