Now you have a complete CRUD API. Use Postman or a frontend application to test all operations:
Example Test Scenarios
Create a user (POST)
POST /users
Body: {"username": "john", "email": "john@example.com"}
Expected: 201 Created with user object
Get all users
GET /users
Expected: Array of all users
Get single user
GET /users/1
Expected: Single user object
Update user (PUT)
PUT /users/1
Body: {"username": "john_updated", "email": "john.new@example.com"}
Expected: Updated user object
Partially update user (PATCH)
PATCH /users/1
Body: {"username": "john_partial"}
Expected: User with updated username only
Delete user (DELETE)
DELETE /users/1
Expected: 204 No Content