Sync fastapi docs from 50fa3f7c on 2026-01-11

docs_src/settings/app02_py39/config.py

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+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    app_name: str = "Awesome API"
+    admin_email: str
+    items_per_user: int = 50

docs_src/settings/app02_py39/main.py

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+from functools import lru_cache
+
+from fastapi import Depends, FastAPI
+
+from .config import Settings
+
+app = FastAPI()
+
+
+@lru_cache
+def get_settings():
+    return Settings()
+
+
+@app.get("/info")
+async def info(settings: Settings = Depends(get_settings)):
+    return {
+        "app_name": settings.app_name,
+        "admin_email": settings.admin_email,
+        "items_per_user": settings.items_per_user,
+    }

docs_src/settings/app02_py39/test_main.py

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+from fastapi.testclient import TestClient
+
+from .config import Settings
+from .main import app, get_settings
+
+client = TestClient(app)
+
+
+def get_settings_override():
+    return Settings(admin_email="testing_admin@example.com")
+
+
+app.dependency_overrides[get_settings] = get_settings_override
+
+
+def test_app():
+    response = client.get("/info")
+    data = response.json()
+    assert data == {
+        "app_name": "Awesome API",
+        "admin_email": "testing_admin@example.com",
+        "items_per_user": 50,
+    }