🌐 Update testing events documentation

`lifespan` should be included in th document, instead of only `startup` and `shutdown`

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

@@ -1,5 +1,7 @@
 # Testing Events: startup - shutdown
 
-When you need your event handlers (`startup` and `shutdown`) to run in your tests, you can use the `TestClient` with a `with` statement:
+When you need your event handlers (`lifespan`, `startup` and `shutdown`) to run in your tests, you can use the `TestClient` with a `with` statement:
 
-{* ../../docs_src/app_testing/tutorial003.py hl[9:12,20:24] *}
+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] *}

docs_src/app_testing/tutorial003.py

@@ -1,15 +1,27 @@
+from contextlib import asynccontextmanager
+
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 
-app = FastAPI()
-
 items = {}
 
 
-@app.on_event("startup")
-async def startup_event():
+@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)
+
+# 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}")