KnowHow

import os.path


class Cal(object):
    def __init__(self):
        self.test_string = 'test'

    def save_tmp_file(self, dir_path, file_name):
        if not os.path.exists(dir_path):
            os.mkdir(dir_path)
        file_path = os.path.join(dir_path, file_name)
        with open(file_path, 'w') as f:
            f.write(self.test_string)

    @staticmethod
    def add_num_and_double(x, y):
        if type(x) is not int or type(y) is not int:
            raise ValueError
        result = x + y
        result *= 2
        return result

import unittest

from test.calculation import Cal

release_name = 'lesson'


class CalTest(unittest.TestCase):
    def setUp(self):
        print('setup')
        self.cal = Cal()

    def tearDown(self) -> None:
        print('clean up')
        del self.cal

    @unittest.skipIf(release_name=='lesson', 'skip!!')
    def test_add_num_and_double(self):
        self.assertEqual(self.cal.add_num_and_double(1, 1), 4)

    def test_raise(self):
        with self.assertRaises(ValueError):
            self.cal.add_num_and_double('1', '1')


if __name__ == '__main__':
    unittest.main()