tests(deprecated):

add new check_deprecated context manager for version check, use mark.parametrize from pytest for observer deprecation tests

tests/deprecated.py

@@ -0,0 +1,26 @@
+from contextlib import contextmanager
+from typing import Type
+
+import pytest
+from packaging import version
+
+import aiogram
+
+
+@contextmanager
+def check_deprecated(
+    max_version: str, exception: Type[Exception], warning: Type[Warning] = DeprecationWarning,
+) -> None:
+    """
+    Should be used for modules that are being deprecated or already removed from aiogram
+    """
+
+    parsed_max_version = version.parse(max_version)
+    current_version = version.parse(aiogram.__version__)
+
+    if parsed_max_version <= current_version:
+        with pytest.raises(exception):
+            yield
+    else:
+        with pytest.warns(warning, match=max_version):
+            yield