daniel-c-harvey
94 lines
3.9 KiB
C#
94 lines
3.9 KiB
C#
using DeepDrftContent.Processors;
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namespace DeepDrftTests;
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/// <summary>
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/// Behavioral tests for the duration-derived Mix bucket-count derivation. The contract: capture at a
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/// constant time resolution (≈333 samples/sec) so a 333 ms max-zoom window holds enough samples on any
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/// mix length, clamped to a sane floor (short/degenerate mixes) and an upper cap (extreme outliers).
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/// </summary>
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[TestFixture]
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public class MixWaveformResolutionTests
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{
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[Test]
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public void BucketCountForDuration_TypicalMix_CapturesAtTargetDensity()
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{
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// 3 minutes × 333/s = 59,940 — a typical short mix, comfortably inside [floor, cap].
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var buckets = MixWaveformResolution.BucketCountForDuration(180.0);
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Assert.That(buckets, Is.EqualTo((int)Math.Ceiling(180.0 * MixWaveformResolution.SamplesPerSecond)));
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Assert.That(buckets, Is.EqualTo(59_940));
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}
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[Test]
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public void BucketCountForDuration_SixtyMinuteMix_ProducesAboutOnePointTwoMillion()
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{
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// 60 min × 333/s = 1,198,800 ≈ 1.2M samples (≈1.2 MB datum), still under the cap.
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var buckets = MixWaveformResolution.BucketCountForDuration(3600.0);
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Assert.That(buckets, Is.EqualTo(1_198_800));
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Assert.That(buckets, Is.LessThan(MixWaveformResolution.MaxBucketCount));
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}
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[Test]
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public void BucketCountForDuration_OverHundredMinutes_ClampsToCap()
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{
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// 120 min × 333/s = 2,397,600 > cap → clamps to the cap.
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var buckets = MixWaveformResolution.BucketCountForDuration(7200.0);
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Assert.That(buckets, Is.EqualTo(MixWaveformResolution.MaxBucketCount));
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}
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[Test]
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public void BucketCountForDuration_NearZeroDuration_HitsFloor()
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{
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// 0.1 s × 333/s = 34 buckets, far below the floor → clamps up to the floor.
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var buckets = MixWaveformResolution.BucketCountForDuration(0.1);
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Assert.That(buckets, Is.EqualTo(MixWaveformResolution.MinBucketCount));
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}
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[Test]
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public void BucketCountForDuration_ZeroDuration_HitsFloor()
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{
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Assert.That(MixWaveformResolution.BucketCountForDuration(0.0), Is.EqualTo(MixWaveformResolution.MinBucketCount));
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}
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[Test]
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public void BucketCountForDuration_NegativeOrNaN_HitsFloor()
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{
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Assert.Multiple(() =>
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{
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Assert.That(MixWaveformResolution.BucketCountForDuration(-5.0), Is.EqualTo(MixWaveformResolution.MinBucketCount));
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Assert.That(MixWaveformResolution.BucketCountForDuration(double.NaN), Is.EqualTo(MixWaveformResolution.MinBucketCount));
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});
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}
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[Test]
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public void BucketCountForDuration_DurationAtFloorBoundary_ReturnsFloorThenGrows()
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{
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// floor / 333 = 6.15 s is the duration where the derived count meets the floor exactly.
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const double floorBoundarySeconds = (double)MixWaveformResolution.MinBucketCount / MixWaveformResolution.SamplesPerSecond;
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// Just below the boundary clamps to the floor; just above derives above the floor.
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Assert.Multiple(() =>
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{
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Assert.That(MixWaveformResolution.BucketCountForDuration(floorBoundarySeconds - 0.1), Is.EqualTo(MixWaveformResolution.MinBucketCount));
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Assert.That(MixWaveformResolution.BucketCountForDuration(floorBoundarySeconds + 1.0), Is.GreaterThan(MixWaveformResolution.MinBucketCount));
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});
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}
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[Test]
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public void BucketCountForDuration_DurationAtCapBoundary_ReturnsCap()
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{
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// cap / 333 = 6006.006 s is the duration where the derived count meets the cap exactly.
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const double capBoundarySeconds = (double)MixWaveformResolution.MaxBucketCount / MixWaveformResolution.SamplesPerSecond;
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Assert.Multiple(() =>
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{
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Assert.That(MixWaveformResolution.BucketCountForDuration(capBoundarySeconds + 1.0), Is.EqualTo(MixWaveformResolution.MaxBucketCount));
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Assert.That(MixWaveformResolution.BucketCountForDuration(capBoundarySeconds - 10.0), Is.LessThan(MixWaveformResolution.MaxBucketCount));
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});
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}
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}
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