fox: Add single testing docs for lifespan

docs/en/docs/advanced/testing-events.md

@@ -1,7 +1,13 @@
-# Testing Events: startup - shutdown
+# Testing Events: lifespan and startup - shutdown
+
+When you need `lifespan` to run in your tests, you can use the `TestClient` with a `with` statement:
+
+
+{* ../../docs_src/app_testing/tutorial004.py hl[9:15,26:30] *}
 
-When you need your event handlers (`lifespan`, `startup` and `shutdown`) to run in your tests, you can use the `TestClient` with a `with` statement:
 
 You can read more details about the ["Running lifespan in tests in the official Starlette documentation site."](https://www.starlette.io/lifespan/#running-lifespan-in-tests)
 
-{* ../../docs_src/app_testing/tutorial003.py hl[9:15,32:37] *}
+For the deprecated `startup` and `shutdown` events, you can use the `TestClient` as follows:
+
+{* ../../docs_src/app_testing/tutorial003.py hl[9:12,20:24] *}

docs_src/app_testing/tutorial003.py

@@ -1,27 +1,15 @@
-from contextlib import asynccontextmanager
-
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 
+app = FastAPI()
+
 items = {}
 
 
-@asynccontextmanager
+@app.on_event("startup")
-async def lifespan(app: FastAPI):
+async def startup_event():
     items["foo"] = {"name": "Fighters"}
     items["bar"] = {"name": "Tenders"}
-    yield
-    # clean up items or other work
-    ...
-
-
-app = FastAPI(lifespan=lifespan)
-
-# startup event and shutdown event are deprecated, you should use lifespan instead
-# @app.on_event("startup")
-# async def startup_event():
-#     items["foo"] = {"name": "Fighters"}
-#     items["bar"] = {"name": "Tenders"}
 
 
 @app.get("/items/{item_id}")
@@ -33,4 +21,4 @@ def test_read_items():
     with TestClient(app) as client:
         response = client.get("/items/foo")
         assert response.status_code == 200
-        assert response.json() == {"name": "Fighters"}
+        assert response.json() == {"name": "Fighters"}

docs_src/app_testing/tutorial004.py

@@ -0,0 +1,30 @@
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+
+items = {}
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    items["foo"] = {"name": "Fighters"}
+    items["bar"] = {"name": "Tenders"}
+    yield
+    # clean up items or other work
+    ...
+
+
+app = FastAPI(lifespan=lifespan)
+
+
+@app.get("/items/{item_id}")
+async def read_items(item_id: str):
+    return items[item_id]
+
+
+def test_read_items():
+    with TestClient(app) as client:
+        response = client.get("/items/foo")
+        assert response.status_code == 200
+        assert response.json() == {"name": "Fighters"}