Add failing test to the Pizza class to determine if a pizza is vegetarian or not.
Update pizza_spec.rb to remove unnecessary line in vegetarian test. Update pizza.rb to include vegetarian? method that returns true or false.
Refactor pizza.rb vegetarian? method.
Add a failing test to pizza_spec.rb to add a topping to the pizza toppings array.
Update add_topping test with a direct test of the add_topping method, which it had previously been missing. Add add_topping method in Pizza class and make test pass.
Add test for deliver method to check if the delivery time is within 1 second of 30 minutes from now. Add deliver method to the pizza class to create a delivery time if the pizza is marked for delivery.