def test_should_render_private_variables_with_two_underscores(self) -> None:
        """Test rendering of private variables with two underscores.

        There are three cases:
        1. Variables beginning with a single underscore are private and not rendered.
        2. Variables beginning with a double underscore are private and are rendered.
        3. Variables beginning with anything other than underscores are not private and
           are rendered.
        """
        context = {
            'cookiecutter': OrderedDict(
                [
                    ('foo', 'Hello world'),
                    ('bar', 123),
                    ('rendered_foo', '{{ cookiecutter.foo|lower }}'),
                    ('rendered_bar', 123),
                    ('_hidden_foo', '{{ cookiecutter.foo|lower }}'),
                    ('_hidden_bar', 123),
                    ('__rendered_hidden_foo', '{{ cookiecutter.foo|lower }}'),
                    ('__rendered_hidden_bar', 123),
                ]
            )
        }
        cookiecutter_dict = prompt.prompt_for_config(context, no_input=True)
        assert cookiecutter_dict == OrderedDict(
            [
                ('foo', 'Hello world'),
                ('bar', '123'),
                ('rendered_foo', 'hello world'),
                ('rendered_bar', '123'),
                ('_hidden_foo', '{{ cookiecutter.foo|lower }}'),
                ('_hidden_bar', 123),
                ('__rendered_hidden_foo', 'hello world'),
                ('__rendered_hidden_bar', '123'),
            ]
        )
Test rendering of private variables with two underscores.

        There are three cases:
        1. Variables beginning with a single underscore are private and not rendered.
        2. Variables beginning with a double underscore are private and are rendered.
        3. Variables beginning with anything other than underscores are not private and
           are rendered.
        
tests/test_prompt.py