How to use the pdbpp.DefaultConfig function in pdbpp

def test_config_pygments(monkeypatch):
    import pygments.formatters

    assert not hasattr(DefaultConfig, "use_terminal256formatter")

    p = Pdb(Config=DefaultConfig)

    monkeypatch.delenv("TERM", raising=False)
    assert isinstance(
        p._get_pygments_formatter(), pygments.formatters.TerminalFormatter
    )

    monkeypatch.setenv("TERM", "xterm-256color")
    assert isinstance(
        p._get_pygments_formatter(), pygments.formatters.Terminal256Formatter
    )

    monkeypatch.setenv("TERM", "xterm-kitty")
    assert isinstance(
        p._get_pygments_formatter(), pygments.formatters.TerminalTrueColorFormatter
    )

monkeypatch.setenv("TERM", "xterm-256color")
    assert isinstance(
        p._get_pygments_formatter(), pygments.formatters.Terminal256Formatter
    )

    monkeypatch.setenv("TERM", "xterm-kitty")
    assert isinstance(
        p._get_pygments_formatter(), pygments.formatters.TerminalTrueColorFormatter
    )

    class Config(DefaultConfig):
        formatter = object()

    assert Pdb(Config=Config)._get_pygments_formatter() is Config.formatter

    class Config(DefaultConfig):
        pygments_formatter_class = "pygments.formatters.TerminalTrueColorFormatter"

    assert isinstance(
        Pdb(Config=Config)._get_pygments_formatter(),
        pygments.formatters.TerminalTrueColorFormatter
    )

    source = Pdb(Config=Config).format_source("print(42)")
    assert source.startswith("\x1b[38;2;0;128;")
    assert "print\x1b[39" in source
    assert source.endswith("m42\x1b[39m)\n")

class FakeStdin:
    def __init__(self, lines):
        self.lines = iter(lines)

    def readline(self):
        try:
            line = next(self.lines) + '\n'
            sys.stdout.write(line)
            return line
        except StopIteration:
            return ''


class ConfigTest(DefaultConfig):
    highlight = False
    use_pygments = False
    prompt = '# '  # because + has a special meaning in the regexp
    editor = 'emacs'
    stdin_paste = 'epaste'
    disable_pytest_capturing = False
    current_line_color = 44


class ConfigWithHighlight(ConfigTest):
    highlight = True


class ConfigWithPygments(ConfigTest):
    use_pygments = True