Add print to confirm that the failed_test_stories.yml has been saved

changelog/3998.improvement.md

@@ -0,0 +1 @@
+Added a message showing the location where the failed stories file was saved.

rasa/cli/test.py

@@ -17,6 +17,8 @@
 )
 import rasa.shared.utils.validation as validation_utils
 import rasa.cli.utils
+from rasa.shared.utils.cli import print_info
+from rasa.core.test import FAILED_STORIES_FILE
 
 logger = logging.getLogger(__name__)
 
@@ -101,6 +103,8 @@ def run_core_test(args: argparse.Namespace) -> None:
     else:
         test_core_models(args.model, stories, output)
 
+    print_info("Failed stories written to {}/{}".format(output, FAILED_STORIES_FILE))
+
 
 def run_nlu_test(args: argparse.Namespace) -> None:
     """Run NLU tests."""