public void ProcessResponse_Should_ResetIntervalForBadAnswer(ResponseQuality qual)
{
var interval = RepetitionInterval.FromValues(4, 2.5f);
interval.ProcessResponse(qual);
interval.Interval.Should().Be(1);
}
private float CalculateUpdatedEasinessFactor(ResponseQuality responseQuality)
{
int q = (int)responseQuality;
float updated = EasinessFactor - 0.8f + 0.28f * q - 0.02f * q * q;
if (updated < 1.3f)
{
updated = 1.3f;
}
return(updated);
}
public void ProcessResponse_ShouldNot_UpdateStartBadAnswer(ResponseQuality badQuality)
{
var interval = RepetitionInterval.NewDefault();
interval.ProcessResponse(badQuality);
interval.ProcessResponse(badQuality);
interval.ProcessResponse(badQuality);
interval.Interval.Should().Be(0);
interval.ProcessResponse(ResponseQuality.CorrectPerfect);
interval.ProcessResponse(ResponseQuality.CorrectPerfect);
interval.Interval.Should().Be(0);
}
private void TryIncrementInterval(ResponseQuality responseQuality)
{
if (responseQuality < ResponseQuality.CorrectDifficult)
{
if (_interval < 0)
{
return;
}
_interval = 1;
}
else
{
_interval++;
}
}
public void ProcessResponse(ResponseQuality responseQuality)
{
TryIncrementInterval(responseQuality);
EasinessFactor = CalculateUpdatedEasinessFactor(responseQuality);
}