add test

tests/test_arguments.py

@@ -0,0 +1,12 @@
+import rasa_sdk.endpoint as ep
+
+
+def test_arg_parser_endpoints():
+    parser = ep.create_argument_parser()
+    args = ["--endpoints", "endpoint.yml"]
+    cmdline_args = parser.parse_args(args)
+    assert cmdline_args.endpoints == "endpoint.yml"
+
+    help_text = parser.format_help()
+    assert "--endpoints ENDPOINTS" in help_text
+    assert " Configuration file for tracing as a yml file." in help_text