Unittest file Here's a very simple example of how your classes could be used:

$```$

stand $=$ LemonadeStand$(\text{'}$Lemons R Us$\text{'})$ # Create a new LemonadeStand callled 'Lemons R Us$\text{'}$

item$1=$ MenuItem$(\text{'}$lemonade$\text{'},0\mathrm{.}5,1\mathrm{.}5)$ # Create lemonade as a menu item $($wholesale cost $50$ cents, selling price $$1\mathrm{.}50)$

stand.add$\_$menu$\_$item$($item$1)$ # Add lemonade to the menu for 'Lemons R Us$\text{'}$

item$2=$ MenuItem$(\text{'}$nori$\text{'},0\mathrm{.}6,0\mathrm{.}8)$ # Create nori as a menu item $($wholesale cost $60$ cents, selling price $80$ cents$)$

stand.add$\_$menu$\_$item$($item$2)$ # Add nori to the menu for 'Lemons R Us$\text{'}$

item$3=$ MenuItem$(\text{'}$cookie$\text{'},0\mathrm{.}2,1)$ # Create cookie as a menu item $($wholesale cost $20$ cents, selling price $$1\mathrm{.}00)$

stand.add$\_$menu$\_$item$($item$3)$ # Add cookie to the menu for 'Lemons R Us$\text{'}$

# This dictionary records that on day zero, $5$ lemonades were sold, $2$ cookies were sold, and no nori was sold

day$\_0\_$sales $=\{$

'lemonade' : $5,$

'cookie' : $2$

$\}$

stand.enter$\_$sales$\_$for$\_$today$($day$\_0\_$sales$)$ # Record the sales for day zero

print$($f$"$lemonade profit $=\{$stand$.$total$\_$profit$\_$for$\_$menu$\_$item$(\text{'}$lemonade$\text{'})\}")$ # print the total profit for lemonade so far

$```$