public void DataStream_must_calculate_sane_alpha_from_long_halflife()
{
var alpha = EWMA.CalculateAlpha(TimeSpan.FromDays(1), TimeSpan.FromSeconds(3));
Assert.True(alpha <= 1.0d);
Assert.True(alpha >= 0.0d);
Assert.True(alpha >= 0.0d - 0.001 && alpha <= 0.0d + 0.001);
}