Function test_routes

pub fn test_routes(app_state: AppState) -> Router<AppState>

Registers the test routes on a Router<AppState>.

Why mount here (not in main):

• Keeps env-conditional test endpoints colocated with handlers and types.
• Avoids changing the router type in main (prevents trait-bound surprises).
• Improves discoverability and maintenance of the test API surface.

Available routes

• POST /api/test/users
  Create or update a test user. Idempotent — if username exists, updates instead. Always returns the id so it can be deleted in teardown.
• GET /api/test/users?username=NAME
  Fetch a test user by their username.
• DELETE /api/test/users/{id}
  Delete a test user by numeric ID.