Add regression test for SYSTEC ctypes result codes

Author: timothyanderson096-ocdealcheck

test/test_systec_exceptions.py

@@ -0,0 +1,16 @@
+from ctypes import c_ubyte
+
+from can.interfaces.systec.constants import ReturnCode
+from can.interfaces.systec.exceptions import UcanError
+
+
+def test_ucan_error_accepts_ctypes_result_code() -> None:
+    def ucan_write_can_msg_ex() -> None:
+        pass
+
+    result = c_ubyte(ReturnCode.ERR_ILLPARAM)
+
+    error = UcanError(result, ucan_write_can_msg_ex, ("arg",))
+
+    assert error.error_code == ReturnCode.ERR_ILLPARAM
+    assert "wrong parameter handed over to the function" in str(error)