Add test coverage for new type of exception

Signed-off-by: Maksym Kovalchuk <mkovalchuk@nvidia.com>

Author: maksym-kovalchuk

tests/test_util_base.py

@@ -0,0 +1,19 @@
+from unittest.mock import patch, MagicMock
+from utilities_common.util_base import UtilHelper
+
+
+@patch("pkgutil.iter_modules")
+@patch("utilities_common.util_base.log.log_warning")
+def test_module_not_found_error(mock_log_warning, mock_iter_modules):
+    non_existent_module_name = "non-existent-module"
+
+    mock_iter_modules.return_value = [(None, non_existent_module_name, False)]
+
+    plugins_namespace = MagicMock()
+    plugins_namespace.__path__ = "some_path"
+    plugins_namespace.__name__ = "some_name"
+
+    list(UtilHelper().load_plugins(plugins_namespace))
+
+    mock_log_warning.assert_called_once_with("failed to import plugin {0}: No module named '{0}'"
+                                             .format(non_existent_module_name), also_print_to_console=True)