import unittest

class BasicTest(unittest.TestCase):

    def test_empty(self):
        self.assertTrue(True)

    def test_second(self):
        self.assertTrue(True)

    def test_third(self):
        self.assertTrue(True)

    def test_four(self):
        self.assertTrue(True)

if __name__ == '__main__':
    unittest.main()
    print("ok")