67 lines
2.0 KiB
C#
67 lines
2.0 KiB
C#
using FluentAssertions;
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using Xunit;
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namespace PerfectNumbers.Core.Tests;
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[Trait("Category", "Fast")]
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public class ModResidueTrackerTests
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{
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[Fact]
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public void IsDivisible_advances_residue_for_identity()
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{
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var tracker = new ModResidueTracker(ResidueModel.Identity);
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tracker.IsDivisible(5, 2).Should().BeFalse();
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tracker.IsDivisible(6, 2).Should().BeTrue();
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tracker.IsDivisible(7, 2).Should().BeFalse();
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}
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[Theory]
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[InlineData(3UL, 7UL, true)]
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[InlineData(5UL, 31UL, true)]
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[InlineData(5UL, 7UL, false)]
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[InlineData(11UL, 23UL, true)]
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[InlineData(11UL, 31UL, false)]
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public void IsDivisible_handles_mersenne_model(ulong p, ulong divisor, bool expected)
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{
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var tracker = new ModResidueTracker(ResidueModel.Mersenne);
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tracker.IsDivisible(p, divisor).Should().Be(expected);
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}
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[Fact]
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public void MergeOrAppend_tracks_existing_and_new_divisors()
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{
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var tracker = new ModResidueTracker(ResidueModel.Identity);
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tracker.BeginMerge(10);
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tracker.MergeOrAppend(10, 3, out bool d3).Should().BeTrue();
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d3.Should().BeFalse();
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tracker.MergeOrAppend(10, 5, out bool d5).Should().BeTrue();
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d5.Should().BeTrue();
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tracker.BeginMerge(10);
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tracker.MergeOrAppend(10, 4, out bool d4).Should().BeTrue();
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d4.Should().BeFalse();
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tracker.BeginMerge(11);
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tracker.MergeOrAppend(11, 3, out d3).Should().BeTrue();
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d3.Should().BeFalse();
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tracker.MergeOrAppend(11, 4, out d4).Should().BeTrue();
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d4.Should().BeFalse();
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tracker.MergeOrAppend(11, 5, out d5).Should().BeTrue();
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d5.Should().BeFalse();
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}
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[Fact]
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public void IsDivisible_requires_non_decreasing_numbers()
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{
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var tracker = new ModResidueTracker(ResidueModel.Identity);
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tracker.IsDivisible(5, 2);
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Action act = () => tracker.IsDivisible(4, 2);
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act.Should().Throw<InvalidOperationException>();
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}
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}
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