public void difficulty_can_not_be_less_than_0()
{
var item = new ReviewItemBuilder().Due().WithDifficultyRating(0).Build();
var strategy = new SuperMemo2ReviewStrategy();
var actualDifficulty = strategy.AdjustDifficulty(item, ReviewOutcome.Perfect);
var expectedDifficulty = new DifficultyRating(0);
Assert.That(actualDifficulty, Is.EqualTo(expectedDifficulty));
}
public void perfect_review_lowers_difficulty()
{
var item = new ReviewItemBuilder().Due().WithDifficultyRating(50).Build();
var strategy = new SuperMemo2ReviewStrategy();
var actualDifficulty = strategy.AdjustDifficulty(item, ReviewOutcome.Perfect);
var expectedDifficulty = new DifficultyRating(41);
Assert.That(actualDifficulty, Is.EqualTo(expectedDifficulty));
}
public void hesitant_review_leaves_difficulty_the_same()
{
var item = new ReviewItemBuilder().Due().WithDifficultyRating(50).Build();
var strategy = new SuperMemo2ReviewStrategy();
var actualDifficulty = strategy.AdjustDifficulty(item, ReviewOutcome.Hesitant);
var expectedDifficulty = new DifficultyRating(50);
Assert.That(actualDifficulty, Is.EqualTo(expectedDifficulty));
}