defmodule GlickoTest do use ExUnit.Case alias Glicko.{ Player, Result, } doctest Glicko @player Player.new_v1([rating: 1500, rating_deviation: 200]) |> Player.to_v2 @results [ {{1400, 30}, 1.0}, Result.new({1550, 100}, :loss), Result.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 @valid_player_rating_deviation_after_no_results 200.2714 |> Player.scale_rating_deviation_to(:v2) test "new rating (with results)" 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 test "new rating (no results)" do %Player{rating_deviation: new_rating_deviation} = Glicko.new_rating(@player, []) assert_in_delta new_rating_deviation, @valid_player_rating_deviation_after_no_results, 1.0e-4 end end