def test_flatten(self):
"""
flatten yields a one-dimensional list when passed a multi-dimensional list of values
"""
self.assertEqual([1, 2, 3, 4, 5, 6, 7, 8], list(flatten([[1], 2, [[3, 4], 5], [[[]]], [[[6]]], 7, 8, []])))
def test_empty_list(self):
"""
flatten yields an empty list when passed an empty list
"""
self.assertEqual([], list(flatten([])))
