def test_fred_series_vintage_dates(self):
fred.key('123abc')
fred.vintage('AAA', sort='desc')
expected = 'https://api.stlouisfed.org/fred/series/vintagedates'
params = {
'api_key': '123abc',
'series_id': 'AAA',
'sort_order': 'desc',
'file_type': 'json'}
self.get.assert_called_with(expected, params=params)
