def test_get_build_year_month_text(self):
     self.assertIsNone(DataHelper.get_build_year_month_text(0, 0), )
     self.assertIsNone(DataHelper.get_build_year_month_text(0, 1), )
     self.assertEqual(
         DataHelper.get_build_year_month_text(2000, 0),
         '2000年築',
     )
     self.assertEqual(
         DataHelper.get_build_year_month_text(2000, 3),
         '2000年3月築',
     )
 def build_year_month(self):
     return DataHelper.get_build_year_month_text(self.build_year,
                                                 self.build_month)