Add test coverage for wait_for_response

Author: NeonDaniel

test/unittests/test_client.py

@@ -226,7 +226,7 @@ def test_message_drop_invalid(self):
 
 class TestClientConnections(unittest.TestCase):
     service_proc: Process = None
-    num_clients = 128
+    num_clients = 256
     clients = []
 
     @classmethod
@@ -316,3 +316,39 @@ def handler(message):
         for client in self.clients:
             client.close()
         self.clients = []
+
+    def test_wait_for_response(self):
+        threads = list()
+        handlers = list()
+
+        def _handler(message):
+            self.assertIn(message.data['idx'], message.msg_type)
+            self.clients[0].emit(message.response())
+
+        def _await_response(client, idx):
+            message_type = f"test.message.{idx}"
+            context = {"test": secrets.token_hex(512)}
+            resp = client.wait_for_response(Message(message_type, {"idx": idx},
+                                                    context))
+            self.assertIsInstance(resp, Message)
+            self.assertEqual(resp.msg_type, f"{message_type}.response")
+            self.assertEqual(resp.context['test'], context['test'])
+
+        for i in range(self.num_clients):
+            client = MessageBusClient()
+            self.clients.append(client)
+            client.run_in_thread()
+            self.assertTrue(client.connected_event.wait(5))
+            message_type = f"test.message.{i}"
+            handler = Mock(side_effect=_handler)
+            handlers.append(handler)
+            client.on(message_type, handler)
+
+        for idx, client in enumerate(self.clients):
+            t = Thread(target=_await_response, args=(client, idx))
+            threads.append(t)
+            t.start()
+
+        for thread in threads:
+            thread.join(3)
+            self.assertFalse(thread.is_alive())