"""Unit tests for flake8.options.config.MergedConfigParser."""
import mock
import pytest

from flake8.options import config
from flake8.options import manager


@pytest.fixture
def optmanager():
    return manager.OptionManager(prog='flake8', version='3.0.0a1')


@pytest.mark.parametrize('args,extra_config_files', [
    (None, None),
    (None, []),
    (None, ['foo.ini']),
    ('flake8/', []),
    ('flake8/', ['foo.ini']),
])
def test_creates_its_own_config_file_finder(args, extra_config_files,
                                            optmanager):
    """Verify we create a ConfigFileFinder correctly."""
    class_path = 'flake8.options.config.ConfigFileFinder'
    with mock.patch(class_path) as ConfigFileFinder:
        parser = config.MergedConfigParser(
            option_manager=optmanager,
            extra_config_files=extra_config_files,
            args=args,
        )

    assert parser.program_name == 'flake8'
    ConfigFileFinder.assert_called_once_with(
        'flake8',
        args,
        extra_config_files or [],
    )


def test_parse_cli_config(optmanager):
    pass