@pytest.mark.parametrize('amount,expect_fee', [

    (40, 3),

    (80, 6),

])

def test_conditional(amount, expect_fee):

    expect_cash = amount - expect_fee

    amount_s = '{:.02f}'.format(amount)

    render_vars = template_vars('Buyer', amount_s)

    lines = render_lines(render_vars, 'Conditional')

    assert lines == [

        "",

        "2015/03/14 Buyer",

        "  Assets:Cash  {:.02f} USD".format(expect_cash),

        "  Expenses:Banking Fees  {:.02f} USD".format(expect_fee),

        "  Income:Sales  -{} USD".format(amount_s),

    ]