测试: 添加验证中间件测试

tests/backend/validate.test.js

@@ -0,0 +1,9 @@
+const validate = require('../../backend/src/middleware/validate');
+
+describe('Validate Middleware', () => {
+  test('should validate required fields', () => {
+    const schema = { username: { required: true } };
+    // Test validation logic
+    expect(true).toBe(true);
+  });
+});