public void six_day_interval_after_card_is_reviewed_correctly_once() { var item = new ReviewItemBuilder().WithLastReviewDate(_clock.Now().AddDays(-10)).WithCorrectReviewStreak(1).Build(); var strategy = new SuperMemo2ReviewStrategy(_clock); var nextReview = strategy.NextReview(item); Assert.That(nextReview, Is.EqualTo(item.ReviewDate.AddDays(6))); }
public void one_day_interval_for_items_without_correct_review() { var item = new ReviewItemBuilder().NeverReviewed().Build(); var strategy = new SuperMemo2ReviewStrategy(_clock); var nextReview = strategy.NextReview(item); Assert.That(nextReview, Is.EqualTo(_clock.Now())); }
public void n_plus_2_is_interval_days_since_last_review_times_easiness_factor() { var item = new ReviewItemBuilder() .WithLastReviewDate(_clock.Now().AddDays(-1)) .WitPreviousReviewDate(11) .WithCorrectReviewStreak(3) .WithDifficultyRating(DifficultyRating.Easiest) .Build(); var strategy = new SuperMemo2ReviewStrategy(_clock); var nextReview = strategy.NextReview(item); Assert.That(nextReview, Is.EqualTo(item.ReviewDate.AddDays(25))); }
public void long_interval_for_easy_cards() { var difficultyRating = DifficultyRating.Easiest; var daysSincePreviousReview = 11; var item = new ReviewItemBuilder() .WithLastReviewDate(_clock.Now().AddDays(-1)) .WitPreviousReviewDate(daysSincePreviousReview) .WithDifficultyRating(difficultyRating) .WithCorrectReviewStreak(3) .Build(); var strategy = new SuperMemo2ReviewStrategy(_clock); var nextReview = strategy.NextReview(item); var expectedInterval = (daysSincePreviousReview - 1) * strategy.DifficultyRatingToEasinessFactor(difficultyRating); Assert.That(nextReview, Is.EqualTo(item.ReviewDate.AddDays(expectedInterval))); }
public void when_is_the_next_review_due() { var item = new ReviewItem { DifficultyRating = 12, ReviewDate = new DateTime(2013, 09, 18), CorrectReviewStreak = 8, }; var strategy = new SuperMemo2ReviewStrategy(); Debug.WriteLine(strategy.NextReview(item)); }