# -*- coding: utf-8 -*-

import unittest
from main import ensure_one_and_only_one_not_none, ensure_all_none  # Update to import from your main.py


class TestEnsureFunctions(unittest.TestCase):

    def test_ensure_one_and_only_one_not_null(self):
        value_error_cases = [
            dict(),
            dict(a=None, b=None),
            dict(a=1, b=1),
        ]
        good_cases = [
            dict(a=None, b=1),
            dict(a=1, b=None),
            dict(a=None, b=None, c=1),
        ]
        for kwargs in value_error_cases:
            with self.assertRaises(ValueError):
                ensure_one_and_only_one_not_none(**kwargs)
        for kwargs in good_cases:
            ensure_one_and_only_one_not_none(**kwargs)

    def test_ensure_all_none(self):
        value_error_cases = [
            dict(),
            dict(a=None, b=1),
            dict(a=1, b=None),
            dict(a=1, b=1),
        ]
        good_cases = [
            dict(a=None),
            dict(a=None, b=None),
        ]
        for kwargs in value_error_cases:
            with self.assertRaises(ValueError):
                ensure_all_none(**kwargs)
        for kwargs in good_cases:
            ensure_all_none(**kwargs)


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