1 files changed, 34 insertions, 0 deletions
diff --git a/bin/tests/system/isctest/check.py b/bin/tests/system/isctest/check.py
new file mode 100644
index 0000000..1fabad7
--- /dev/null
+++ b/bin/tests/system/isctest/check.py
@@ -0,0 +1,34 @@
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# SPDX-License-Identifier: MPL-2.0
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0.  If a copy of the MPL was not distributed with this
+# file, you can obtain one at https://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+from typing import Any
+
+import dns.rcode
+import dns.message
+
+
+# compatiblity with dnspython<2.0.0
+try:
+    # In dnspython>=2.0.0, dns.rcode.Rcode class is available
+    # pylint: disable=invalid-name
+    dns_rcode = dns.rcode.Rcode  # type: Any
+except AttributeError:
+    # In dnspython<2.0.0, selected rcodes are available as integers directly
+    # from dns.rcode
+    dns_rcode = dns.rcode
+
+
+def rcode(message: dns.message.Message, expected_rcode) -> None:
+    assert message.rcode() == expected_rcode, str(message)
+
+
+def noerror(message: dns.message.Message) -> None:
+    rcode(message, dns_rcode.NOERROR)