Add a failing test for Topping.initialize.
Add initialize method and attr_accessor to class Topping
Add failing vegetarian test for Topping.initialize
Add optional vegetarian parameter to Topping.new and add test to rspec
Add failing test to Pizza.initialize
Add Pizza.initialize method to pizza.rb
Add failing test to Pizza.initialize. Tests if default topping is cheese
Set cheese as default topping
Remove pry_debugger from spec