76 lines
2.9 KiB
C#
76 lines
2.9 KiB
C#
using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Linq;
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using System.Threading.Tasks;
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using FastRng.Double;
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using NUnit.Framework;
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namespace FastRngTests.Double.Distributions
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{
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[ExcludeFromCodeCoverage]
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public class CauchyLorentz
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{
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public void TestCauchyDistribution01()
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{
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// The properties of the cauchy distribution cannot be tested by mean, media or variance,
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// cf. https://en.wikipedia.org/wiki/Cauchy_distribution#Explanation_of_undefined_moments
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}
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[Test]
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[Category(TestCategories.COVER)]
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[Category(TestCategories.NORMAL)]
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public async Task TestCauchyGeneratorWithRange01()
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{
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var rng = new MultiThreadedRng();
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var samples = new double[1_000];
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for (var n = 0; n < samples.Length; n++)
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samples[n] = await rng.NextNumber(-1.0, 1.0, new FastRng.Double.Distributions.CauchyLorentz());
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rng.StopProducer();
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Assert.That(samples.Min(), Is.GreaterThanOrEqualTo(-1.0), "Min is out of range");
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Assert.That(samples.Max(), Is.LessThanOrEqualTo(1.0), "Max is out of range");
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}
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[Test]
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[Category(TestCategories.COVER)]
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[Category(TestCategories.NORMAL)]
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public async Task TestCauchyGeneratorWithRange02()
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{
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var rng = new MultiThreadedRng();
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var samples = new double[1_000];
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for (var n = 0; n < samples.Length; n++)
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samples[n] = await rng.NextNumber(0.0, 1.0, new FastRng.Double.Distributions.CauchyLorentz());
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rng.StopProducer();
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Assert.That(samples.Min(), Is.GreaterThanOrEqualTo(0.0), "Min is out of range");
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Assert.That(samples.Max(), Is.LessThanOrEqualTo(1.0), "Max is out of range");
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}
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[Test]
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[Category(TestCategories.COVER)]
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[Category(TestCategories.NORMAL)]
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public void ParameterTest01()
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{
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var dist = new FastRng.Double.Distributions.CauchyLorentz();
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Assert.Throws<ArgumentOutOfRangeException>(() => dist.Scale = 0);
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Assert.Throws<ArgumentOutOfRangeException>(() => dist.Scale = -78);
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Assert.DoesNotThrow(() => dist.Scale = 0.0001);
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Assert.DoesNotThrow(() => dist.Scale = 4);
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Assert.DoesNotThrow(() => dist.Median = -45);
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Assert.DoesNotThrow(() => dist.Median = 15);
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Assert.DoesNotThrow(() => dist.Median = 0);
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}
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[Test]
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[Category(TestCategories.COVER)]
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[Category(TestCategories.NORMAL)]
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public async Task NoRandomNumberGenerator01()
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{
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var dist = new FastRng.Double.Distributions.CauchyLorentz();
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Assert.DoesNotThrowAsync(async () => await dist.GetDistributedValue());
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Assert.That(await dist.GetDistributedValue(), Is.NaN);
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}
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}
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} |