public function testDiscountRoundingError()
{
// This extension adds a fractional discount, which could cause
// the displayed unit price not to match the charged price at
// large quantities.
Product::add_extension('ProductTest_FractionalDiscountExtension');
DataObject::flush_and_destroy_cache();
$tshirt = Product::get()->byID($this->tshirt->ID);
Config::inst()->update('Order', 'rounding_precision', 2);
$this->assertEquals(24.99, $tshirt->sellingPrice());
Config::inst()->update('Order', 'rounding_precision', 3);
$this->assertEquals(24.985, $tshirt->sellingPrice());
Product::remove_extension('ProductTest_FractionalDiscountExtension');
}
