78 lines
2.3 KiB
C#
78 lines
2.3 KiB
C#
using Flashsharp.Domain;
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using Flashsharp.Scheduling;
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namespace Flashsharp.Tests;
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public sealed class SchedulerTests
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{
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static readonly DateTime Now = new(2026, 10, 22, 12, 0, 0, DateTimeKind.Utc);
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[Fact]
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public void First_good_review_is_due_tomorrow()
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{
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var next = Scheduler.Next(null, ReviewRating.Good, Now);
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Assert.Equal(86_400, next.IntervalSeconds);
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Assert.Equal(1, next.Repetitions);
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Assert.Equal(0, next.Lapses);
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Assert.Equal(2.5, next.Ease, 3);
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Assert.Equal(Now.AddDays(1), next.DueAt);
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}
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[Fact]
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public void Third_good_review_multiplies_by_ease()
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{
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var first = Scheduler.Next(null, ReviewRating.Good, Now);
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var second = Scheduler.Next(first, ReviewRating.Good, Now);
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var third = Scheduler.Next(second, ReviewRating.Good, Now);
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Assert.Equal(3 * 86_400, second.IntervalSeconds);
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Assert.Equal((int)(3 * 86_400 * 2.5), third.IntervalSeconds);
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Assert.Equal(3, third.Repetitions);
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}
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[Fact]
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public void Again_resets_repetitions_and_adds_a_lapse()
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{
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var first = Scheduler.Next(null, ReviewRating.Good, Now);
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var next = Scheduler.Next(first, ReviewRating.Again, Now);
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Assert.Equal(600, next.IntervalSeconds);
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Assert.Equal(0, next.Repetitions);
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Assert.Equal(1, next.Lapses);
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Assert.Equal(2.3, next.Ease, 3);
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}
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[Fact]
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public void Hard_does_not_reset_repetitions()
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{
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var first = Scheduler.Next(null, ReviewRating.Good, Now);
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var next = Scheduler.Next(first, ReviewRating.Hard, Now);
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Assert.Equal(2, next.Repetitions);
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Assert.Equal(0, next.Lapses);
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Assert.True(next.IntervalSeconds >= 43_200);
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}
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[Fact]
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public void Easy_starts_at_three_days_and_raises_ease()
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{
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var next = Scheduler.Next(null, ReviewRating.Easy, Now);
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Assert.Equal(3 * 86_400, next.IntervalSeconds);
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Assert.Equal(2.65, next.Ease, 3);
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}
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[Fact]
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public void Ease_never_goes_below_floor()
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{
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var state = Scheduler.Next(null, ReviewRating.Again, Now);
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for (var i = 0; i < 20; i++)
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{
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state = Scheduler.Next(state, ReviewRating.Again, Now);
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}
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Assert.Equal(1.3, state.Ease, 3);
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}
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}
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