@pytest.mark.parametrize('arg,expected', [

    ('aging', accrual.AgingReport),

    ('balance', accrual.BalanceReport),

    ('outgoing', accrual.OutgoingReport),

    ('age', accrual.AgingReport),

    ('bal', accrual.BalanceReport),

    ('out', accrual.OutgoingReport),

    ('outgoings', accrual.OutgoingReport),

])

def test_report_type_by_name(arg, expected):

    assert accrual.ReportType.by_name(arg.lower()).value is expected

    assert accrual.ReportType.by_name(arg.title()).value is expected

    assert accrual.ReportType.by_name(arg.upper()).value is expected

@pytest.mark.parametrize('arg', [

    'unknown',

    'blance',

    'outgong',

])

def test_report_type_by_unknown_name(arg):

    # Raising ValueError helps argparse generate good messages.

    with pytest.raises(ValueError):

        accrual.ReportType.by_name(arg)