def test_0(self): self.assertEqual(korean_number(0), '영')
def test_1(self): self.assertEqual(korean_number(1), '일')
def test_41(self): self.assertEqual(korean_number(41), '사십일')
def test_100(self): self.assertEqual(korean_number(100), '백')
def test_31(self): self.assertEqual(korean_number(31), '삼십일')
def test_21(self): self.assertEqual(korean_number(21), '이십일')
def test_20(self): self.assertEqual(korean_number(20), '이십')
def test_12(self): self.assertEqual(korean_number(12), '십이')
def test_2(self): self.assertEqual(korean_number(2), '이')