Add a failing test for Topping.initialize
Add attr_accessor to Topping.initialize
Add test Topping.initialize to equal vegetarian. Test fails
Add keyword argument vegetarian: false to Topping.initialize. Add :vegetarian to attr_accessor.
Add test for Pizza.initialize to accept array toppings and set it equal to @toppings with attr_accessor :toppings
Add initialize to Pizza class that accepts toppings paramater toppings, sets @toppings to toppings, and attr_accessor :toppings
Make test to check default Toppings.initialize to equal 'cheese' if no toppings are passed as arguments
Add default of toppings=[Topping.new('cheese')] to Pizza.initialize