code: def test_marshal_wildcard_nested(self):
      nest = fields.Nested(
          OrderedDict(
              [("thumbnail", fields.String), ("video", fields.String)]
          )
      )
      wild = fields.Wildcard(nest)
      wildcard_fields = OrderedDict([("*", wild)])
      model = OrderedDict([("preview", fields.Nested(wildcard_fields))])
      sub_dict = OrderedDict(
          [
              ("9:16", {"thumbnail": 24, "video": 12}),
              ("16:9", {"thumbnail": 25, "video": 11}),
              ("1:1", {"thumbnail": 26, "video": 10}),
          ]
      )
      marshal_dict = OrderedDict([("preview", sub_dict)])
      output = marshal(marshal_dict, model)
      assert output == {
          "preview": {
              "1:1": {"thumbnail": "26", "video": "10"},
              "16:9": {"thumbnail": "25", "video": "11"},
              "9:16": {"thumbnail": "24", "video": "12"},
          }
      }
  
imports: from __future__ import unicode_literals
  import pytest
  from flask_restplus import marshal, marshal_with, marshal_with_field, fields, Api, Resource
label_desc: Use image node_id 2 for calling the MarshallingTest obj's underlying member method code with example usage: obj.test_marshal_wildcard_nested() without return types