def test_open(json_mock):
reader = JsonInputReader()
json_mock.load.return_value = 'sample output'
assert reader._JsonInputReader__data == None
reader.open(123)
json_mock.load.assert_called_with(123)
assert reader._JsonInputReader__data == 'sample output'
def test_iter(test_iter_args):
reader = JsonInputReader()
reader._JsonInputReader__data = dict(transactions=[test_iter_args[0]])
iterator = iter(reader)
n = iterator.next()
assert type(n) == type(test_iter_args[1])
assert vars(n) == vars(test_iter_args[1])