Update tests/test_source_cli.py

Author: hramezani

tests/test_source_cli.py

@@ -2174,7 +2174,7 @@ class Settings(BaseSettings, cli_parse_args=True):
   -h, --help            show this help message and exit
 
 visible_obj options:
-  --visible_obj JSON    set visible_obj from JSON string
+  --visible_obj [JSON]  set visible_obj from JSON string (default: {{}})
   --visible_obj.visible_a int
                         (required)
   --visible_obj.visible_b int