certbot/acme/tests/magic_typing_test.py

"""Tests for acme.magic_typing."""
import sys
import unittest

try:
    import mock
except ImportError: # pragma: no cover
    from unittest import mock # type: ignore


class MagicTypingTest(unittest.TestCase):
    """Tests for acme.magic_typing."""
    def test_import_success(self):
        try:
            import typing as temp_typing
        except ImportError: # pragma: no cover
            temp_typing = None # pragma: no cover
        typing_class_mock = mock.MagicMock()
        text_mock = mock.MagicMock()
        typing_class_mock.Text = text_mock
        sys.modules['typing'] = typing_class_mock
        if 'acme.magic_typing' in sys.modules:
            del sys.modules['acme.magic_typing'] # pragma: no cover
        from acme.magic_typing import Text
        self.assertEqual(Text, text_mock)
        del sys.modules['acme.magic_typing']
        sys.modules['typing'] = temp_typing

    def test_import_failure(self):
        try:
            import typing as temp_typing
        except ImportError: # pragma: no cover
            temp_typing = None # pragma: no cover
        sys.modules['typing'] = None
        if 'acme.magic_typing' in sys.modules:
            del sys.modules['acme.magic_typing'] # pragma: no cover
        from acme.magic_typing import Text
        self.assertTrue(Text is None)
        del sys.modules['acme.magic_typing']
        sys.modules['typing'] = temp_typing


if __name__ == '__main__':
    unittest.main()  # pragma: no cover