def METHOD_NAME(empty_swagger_spec):
    result = unmarshal_array(
        empty_swagger_spec,
        {
            'type': 'array',
            'items': {
                'type': 'string',
                'format': 'date',
            },
            'default': ['2019-05-22'],
        },
        None,
    )
    assert [datetime.date(2019, 5, 22)] == result