tests: test_show_typing_notification: Partially stabilize test_show_typing_notification.

Used a background thread to reduce timing flakiness in test_show_typing_notification. While this improves stability, the loop timing still depends on the Timer clearing active_conversation_info, so the test can intermittently fail. (time.sleep added to show_typing_notification to reproduce flaky bug more reliably. Will be deleted once bug is resolved)

Author: kkieu

tests/core/test_core.py

@@ -597,7 +597,9 @@ def mock_typing() -> None:
             controller.active_conversation_info = {}
 
         Timer(0.1, mock_typing).start()
-        Thread(controller.show_typing_notification()).start()
+        thread = Thread(target=controller.show_typing_notification)
+        thread.start()
+        thread.join(timeout=1)
 
         if active_conversation_info:
             set_footer_text.assert_has_calls(

zulipterminal/core.py

@@ -451,6 +451,7 @@ def show_typing_notification(self) -> None:
 
         # Until conversation becomes "inactive" like when a `stop` event is sent
         while self.active_conversation_info:
+            time.sleep(0.5) #To reproduce flakey test
             sender_name = self.active_conversation_info["sender_name"]
             self.view.set_footer_text(
                 [