def test_answer(self):
self.assertEqual(49, len(digit_powers()))
def test_digit_powers(self):
for num in digit_powers():
digits = number_as_digits(num)
root = int(round(pow(num, 1.0 / len(digits))))
self.assertEqual(num, root ** len(digits))
def test_sample_input(self):
res = set(digit_powers())
self.assertTrue(16807 in res)
self.assertTrue(134217728 in res)