def test_is_lucky_8(self):
     eq_(True, is_lucky(8))
 def test_is_lucky_number_91(self):
     eq_(False, is_lucky(91))
 def test_is_lucky_number_18(self):
     eq_(True, is_lucky(18))
 def test_is_lucky_number_81(self):
     eq_(True, is_lucky(81))
 def test_is_lucky_number_less_than_8(self):
     eq_(False, is_lucky(5))