def test_no_digits(self):
'''Testing remove_digits() with a string containing no digits.
'''
self.assertEqual(asstfile.remove_digits('nope, there really aren\'t any digits here.'),
'nope, there really aren\'t any digits here.',
'Removing digits from a string with no digits should result in the identical string.')
def test_several_digits(self):
'''Testing remove_digits() with a string containing multiple digits.
'''
self.assertEqual(asstfile.remove_digits('m435345u34534lti543543pl345e3 45d345i3g4534i5ts345'),
'multiple digits',
'Removing digits from a string with multiple digits should result in a string with every digit removed.')
def test_empty_string(self):
'''Testing remove_digits() with an empty string.
'''
self.assertEqual(asstfile.remove_digits(''),
'',
'Removing digits from the empty string should result in the empty string.')
