diff --git a/test/functional/api/cas/cli_messages.py b/test/functional/api/cas/cli_messages.py
new file mode 100644
index 0000000..d4daada
--- /dev/null
+++ b/test/functional/api/cas/cli_messages.py
@@ -0,0 +1,34 @@
+#
+# Copyright(c) 2019 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause-Clear
+#
+import re
+
+from core.test_run import TestRun
+from test_utils.output import Output
+
+
+load_inactive_core_missing = [
+    r"WARNING: Can not resolve path to core \d+ from cache \d+\. By-id path will be shown for that "
+    r"core\.",
+    r"WARNING: Cache is in incomplete state - at least one core is inactive",
+    r"Successfully added cache instance \d+"
+]
+
+remove_inactive_core = [
+    r"Error while removing core device \d+ from cache instance \d+",
+    r"Core device is in inactive state"
+]
+
+stop_cache_incomplete = [
+    r"Error while removing cache \d+",
+    r"Cache is in incomplete state - at least one core is inactive"
+]
+
+
+def check_msg(output: Output, expected_messages):
+    result = '\n'.join([output.stdout, output.stderr])
+    for msg in expected_messages:
+        matches = re.search(msg, result)
+        if not matches:
+            TestRun.fail(f"Message is incorrect, expected: {msg}\n actual: {result}.")