test: document configure_app test

Author: alukach

tests/test_configure_app.py

@@ -1,3 +1,5 @@
+"""Tests for configuring an external FastAPI application."""
+
 from fastapi import FastAPI
 from fastapi.routing import APIRoute
 
@@ -6,6 +8,7 @@
 
 
 def test_configure_app_excludes_proxy_route():
+    """Ensure `configure_app` adds health route and omits proxy route."""
     app = FastAPI()
     settings = Settings(
         upstream_url="https://example.com",