def test_merge_append_additional(self):

        schema = {'mergeStrategy': 'objectMerge',
                  'properties': {
                      'b': {'mergeStrategy': 'overwrite'}
                  },
                  'additionalProperties': {
                      'mergeStrategy': 'append'
                  }}

        expected = {'properties': {
                        'b': {},
                    },
                    'additionalProperties': {}
                }

        merger = jsonmerge.Merger(schema)
        schema2 = merger.get_schema()

        self.assertEqual(schema2, expected)