public void ReturnsSameLoserRatingWithIterationsAndSingleCall()
{
var formula = new EloFormula();
var initialW = 1400d;
var initialL = 1234d;
var iterations = 500u;
double LoserRatingAfterIterations()
{
var one = 1u;
var winner = initialW;
var loser = initialL;
for (var i = 0; i < iterations; ++i)
{
var w = winner;
var l = loser;
winner = formula !.WinnerNewRating(w, new[] { new DefaultMatch(l, one) });
loser = formula.LoserNewRating(l, new DefaultMatch(w, one));
}
return(loser);
}
Assert.Equal(
formula.LoserNewRating(initialL, new DefaultMatch(initialW, iterations)),
LoserRatingAfterIterations(),
6);
}
public void DoesntChangeRatingSum()
{
var formula = new EloFormula(2d, 400d, 1500d);
var winner = formula.DefaultRating();
var loser = formula.DefaultRating();
var count = 500u;
var w = winner;
var l = loser;
winner = formula.WinnerNewRating(w, new[] { new DefaultMatch(l, count) });
loser = formula.LoserNewRating(l, new DefaultMatch(w, count));
Assert.Equal(w + l, winner + loser, 5);
}
public void ReturnsPositiveRatingAfterManyLoses()
{
var formula = new EloFormula(2d, 400d, 1500d);
var winner = formula.DefaultRating();
var loser = formula.DefaultRating();
var count = 10u;
for (var i = 0; i < 500; ++i)
{
var w = winner;
var l = loser;
winner = formula.WinnerNewRating(w, new[] { new DefaultMatch(l, count) });
loser = formula.LoserNewRating(l, new DefaultMatch(w, count));
}
Assert.True(loser > 0);
}
public void DoesntChangeRatingSumOfThree()
{
var formula = new EloFormula(2d, 400d, 1500d);
var first = formula.DefaultRating();
var second = formula.DefaultRating();
var three = formula.DefaultRating();
var f = first;
var s = second;
var t = three;
first = formula.WinnerNewRating(f, new[]
{
new DefaultMatch(s, 110),
new DefaultMatch(t, 19),
});
second = formula.LoserNewRating(s, new DefaultMatch(f, 110));
three = formula.LoserNewRating(t, new DefaultMatch(f, 19));
Assert.Equal(f + s + t, first + second + three, 5);
}