NOTE: The only way to test is to place breakpoint at `OrderCalculator::getDiscountInfo` method.
# in Admin Console:
# go to {nav E-commerce > Discounts & Certificates} section
* create 15% discount for `Whole Order` to `Everybody` user group on `Discounts` tab
* create 15% coupon for `Whole Order` on `Coupons` tab
# go to {nav Website & Content > Structure & Data > Products} section
* create Tangible product with `39.5` price
# on Front-End:
* add product created before to cart
* confirm, that `$discounted_price` variable value is `33.5750`
* disable discount in Admin Console
* confirm, that `$discounted_price` variable value no longer contains discount
* enter code of previously created coupon
* confirm, that `$couponed_price` variable value is `33.5750`