{
  "admin": {
    "username": "admin",
    "password": "admin123",
    "email": "admin@example.com",
    "role": "admin"
  },
  "regularUser": {
    "username": "testuser",
    "password": "test123",
    "email": "testuser@example.com",
    "role": "user"
  },
  "invalidUser": {
    "username": "invalid",
    "password": "wrongpassword",
    "email": "invalid@example.com",
    "role": "user"
  }
}