Read the Wikipedia article on the game of fizz buzz (just the section entitled Play).
Next, implement fizz buzz from scratch. For any given number n return a list of the n first fizz buzz values. Use Ruby and RSpec, commit your result to a new public GitHub repo.
FizzBuzzGame.new(10).play # => [1, 2, "Fizz", 4, "Buzz", "Fizz", 7, 8, "Fizz", "Buzz"]