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### test.py
import unittest
import os


def custom_function(file_name):
    with open(file_name, 'rt') as f:
        return sum(1 for _ in f)


class CustomTests(unittest.TestCase):
    def setUp(self):
        self.file_name = 'test_file.txt'
        with open(self.file_name, 'wt') as f:
            f.write("Good!")
    def tearDown(self):
        try:
            os.remove(self.file_name)
        except:
            pass


    ### test_ 로 시작하는 method는 모두 test method가 됨
    def test_line_count(self):
        self.assertEqual(custom_function(self.file_name), 1)
    def test_no_file(self):
        with self.assertRaises(IOError):
            custom_function("abc.txt")
    def test_runs(self):
        custom_function(self.file_name)


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