Add unit tests for custom exception hierarchy

Author: gemenerik

tests/test_exceptions.py

@@ -0,0 +1,35 @@
+# ,---------,       ____  _ __
+# |  ,-^-,  |      / __ )(_) /_______________ _____  ___
+# | (  O  ) |     / __  / / __/ ___/ ___/ __ `/_  / / _ \
+# | / ,--'  |    / /_/ / / /_/ /__/ /  / /_/ / / /_/  __/
+#    +------`   /_____/_/\__/\___/_/   \__,_/ /___/\___/
+#
+# Copyright (C) 2026 Bitcraze AB
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+import pytest
+
+import cflib2
+
+
+EXCEPTION_NAMES = [name for name in cflib2.__all__ if name.endswith("Error")]
+
+
+class TestExceptionHierarchy:
+    """Verify that all custom exceptions inherit from CrazyflieError."""
+
+    @pytest.mark.parametrize("name", EXCEPTION_NAMES)
+    def test_exception_is_subclass_of_crazyflie_error(self, name: str) -> None:
+        exc_class = getattr(cflib2, name)
+        assert issubclass(exc_class, cflib2.CrazyflieError)