Add passing initialize test
Add passing cannot change name test
Add failing empty menu initialize test
Add passing empty menu intialization
Add passing add menu item method
Add passing add menu item method
Add passing add menu item and default 0 of happy discount
Add passing set value to happy discount setter method
Add failing method for constraining happy hour discount
Add passing methods for 8 intial specs
Add failing get price method
Add passing get price method
Add failing 50% discount method
Add passing 50% discount during happy hour
Add failing test for 50% on Mon and Wed only
Add passing method for determining which discount to apply
Add failing test for exempt drinks
Add passing exemption status
Add failing purchase method to Bar class
Add passing purchase method in Bar class