[+!] all but small

some small modifications, tests added

tests/conftest.py

@@ -11,7 +11,7 @@ import pytest
 @pytest.fixture(scope="session")
 def client_module():
     """Загружает общий тестовый клиент без запуска его командного интерфейса."""
-    path = Path(__file__).parents[1] / "src" / ".test" / "client_test.py"
+    path = Path(__file__).parents[1] / "examples" / "client.py"
     spec = importlib.util.spec_from_file_location("artex_test_client", path)
     module = importlib.util.module_from_spec(spec)
     spec.loader.exec_module(module)
@@ -67,6 +67,7 @@ class Timing:
     def __init__(self):
         self.clock = Clock()
         self.tasks = []
+        self.expected_errors = []
         self.queues = {}
         self.waiting = {}
 
@@ -84,6 +85,11 @@ class Timing:
         self.tasks.append(task)
         return task
 
+    def accept_task_error(self, task, error):
+        assert task in self.tasks and task.done() and not task.cancelled()
+        assert task.exception() is error
+        self.expected_errors.append(error)
+
     async def sleeping(self, label, task=None):
         async with asyncio.timeout(1):
             while True:
@@ -106,7 +112,8 @@ class Timing:
         if exc_type is None:
             for result in results:
                 if isinstance(result, BaseException) and not isinstance(result, asyncio.CancelledError):
-                    raise result
+                    if not any(result is expected for expected in self.expected_errors):
+                        raise result
 
 
 class ConnectionRecorder: