def call_collatz():
print('Enter number:')
while True:
try:
number = int(input())
result = collatz(number)
if result == 1:
return result
except ValueError:
print('You must enter an integer.')
def test_returns_4_when_called_on_8(self):
self.assertEqual(collatz_sequence.collatz(8), 4)
def test_type_error_raised_when_aoeu_is_on_input(self):
with self.assertRaises(TypeError):
collatz_sequence.collatz('aoeu')
def test_returns_16_when_called_on_5(self):
self.assertEqual(collatz_sequence.collatz(5), 16)
def test_2_value_8(self):
self.assertEqual(collatz(8), 4)
def test_3_value_5(self):
self.assertEqual(collatz(5), 16)