"""Tests for the Nothing formatter obbject."""
import optparse

from flake8 import style_guide
from flake8.formatting import default


def options(**kwargs):
    """Create an optparse.Values instance."""
    kwargs.setdefault('output_file', None)
    kwargs.setdefault('tee', False)
    return optparse.Values(kwargs)


def test_format_returns_nothing():
    """Verify Nothing.format returns None."""
    formatter = default.Nothing(options())
    error = style_guide.Violation('code', 'file.py', 1, 1, 'text', '1')

    assert formatter.format(error) is None


def test_show_source_returns_nothing():
    """Verify Nothing.show_source returns None."""
    formatter = default.Nothing(options())
    error = style_guide.Violation('code', 'file.py', 1, 1, 'text', '1')

    assert formatter.show_source(error) is None