defmodule GlickoTest do use ExUnit.Case alias Glicko.{ Player, GameResult, } doctest Glicko @player Player.new_v1([rating: 1500, rating_deviation: 200]) |> Player.to_v2 @results [ GameResult.new(Player.new_v1([rating: 1400, rating_deviation: 30]), :win), GameResult.new(Player.new_v1([rating: 1550, rating_deviation: 100]), :loss), GameResult.new(Player.new_v1([rating: 1700, rating_deviation: 300]), :loss), ] @valid_player_rating_after_results 1464.06 |> Player.scale_rating_to(:v2) @valid_player_rating_deviation_after_results 151.52 |> Player.scale_rating_deviation_to(:v2) @valid_player_volatility_after_results 0.05999 test "new rating" do %Player{rating: new_rating, rating_deviation: new_rating_deviation, volatility: new_volatility} = Glicko.new_rating(@player, @results, [system_constant: 0.5]) assert_in_delta new_rating, @valid_player_rating_after_results, 1.0e-4 assert_in_delta new_rating_deviation, @valid_player_rating_deviation_after_results, 1.0e-4 assert_in_delta new_volatility, @valid_player_volatility_after_results, 1.0e-5 end end