Add a failing test for Topping.initialize.
Add a passing test for Topping.initialize.
Add a failing test for Topping.initialize (vegetarian).
Add a passing test for Topping.initialize (vegetarian).
Add a failing test for Pizza.initialize.
Add a passing test for Pizza.initialize.
Add a failing test for Pizza.initialize (no toppings).
Add a passing test for Pizza.initialize (no toppings).
add gemfile.lock