def test_guess_invalid_empty(self): self.assertEqual(_guess_is_valid('', 'abcd'), False)
def test_guess_invalid_too_long(self): self.assertEqual(_guess_is_valid('sf', 'abcd'), False)
def test_guess_invalid_repeat(self): self.assertEqual(_guess_is_valid('a', 'abcd'), False)
def test_guess_invalid_nonalpha(self): self.assertEqual(_guess_is_valid('1', 'abcd'), False)
def test_guess_valid(self): self.assertEqual(_guess_is_valid('a', 'bcd'), True)