import unittest


# Define some test cases
class TestAddition(unittest.TestCase):
    def test_add_positive(self):
        self.assertEqual(1 + 2, 3)

    def test_add_negative(self):
        self.assertEqual(-1 + (-1), -2)


class TestSubtraction(unittest.TestCase):
    def test_subtract_positive(self):
        self.assertEqual(5 - 3, 2)

    def test_subtract_negative(self):
        self.assertEqual(-5 - (-2), -3)


# Now let's create a TestSuite
def suite():
    suite = unittest.TestSuite()

    # Add tests to the suite
    suite.addTest(TestAddition('test_add_positive'))
    suite.addTest(TestAddition('test_add_negative'))
    suite.addTest(TestSubtraction('test_subtract_positive'))
    # suite.addTest(TestSubtraction('test_subtract_negative'))
    # suite.addTest(TestSubtraction('test_subtract_negative2'))

    return suite


# Running the suite
if __name__ == "__main__":
    runner = unittest.TextTestRunner()
    runner.run(suite())