Add `time.sleep(0.1)` in `test_websocket_handle_disconnection` to make test stable

tests/test_tutorial/test_websockets/test_tutorial003.py

@@ -1,4 +1,5 @@
 import importlib
+import time
 from types import ModuleType
 
 import pytest
@@ -42,11 +43,13 @@ def test_websocket_handle_disconnection(client: TestClient):
         connection.send_text("Hello from 1234")
         data1 = connection.receive_text()
         assert data1 == "You wrote: Hello from 1234"
+        time.sleep(0.01)  # Give server time to process broadcast
         data2 = connection_two.receive_text()
         client1_says = "Client #1234 says: Hello from 1234"
         assert data2 == client1_says
         data1 = connection.receive_text()
         assert data1 == client1_says
         connection_two.close()
+        time.sleep(0.01)  # Give server time to process broadcast
         data1 = connection.receive_text()
         assert data1 == "Client #5678 left the chat"