from __future__ import annotations

import unittest


class LeafTests(unittest.TestCase):
    def test_python_leaf(self) -> None:
        self.assertEqual(2 + 2, 4)


if __name__ == "__main__":
    result = unittest.TextTestRunner(verbosity=1).run(unittest.defaultTestLoader.loadTestsFromTestCase(LeafTests))
    raise SystemExit(0 if result.wasSuccessful() else 1)
