Use TDD to create a Passenger
class that responds to the following interaction pattern. For the adult?
method, a Passenger
is considered an adult if they are age 18 or older.
pry(main)> require './lib/passenger'
# => true
pry(main)> charlie = Passenger.new({"name" => "Charlie", "age" => 18})
# => #<Passenger:0x00007fc1ad88b3c0...>