Follow the instructions here: http://codingdojo.org/cgi-bin/wiki.pl?KataTennis

tennis_game.rb

class TennisGame
 
  def player_one_scores
  end
 
  def player_two_scores
  end
 
  def score
    "Love All"
  end
 
end

tennis_game_spec.rb

require_relative '03_tennis_kata'
require 'minitest/autorun'
 
describe TennisGame do
 
  it "score the start of the game" do
    game = TennisGame.new
    game.score.must_equal "Love All"
  end
end