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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using Microsoft.Xunit.Performance;
namespace Functions
{
public static partial class MathTests
{
// Tests Math.Atan(double) over 5000 iterations for the domain -1, +1
private const double atanDoubleDelta = 0.0004;
private const double atanDoubleExpectedResult = 0.78539816322061329;
[Benchmark]
public static void AtanDoubleBenchmark()
{
foreach (var iteration in Benchmark.Iterations)
{
using (iteration.StartMeasurement())
{
AtanDoubleTest();
}
}
}
public static void AtanDoubleTest()
{
var result = 0.0; var value = -1.0;
for (var iteration = 0; iteration < iterations; iteration++)
{
value += atanDoubleDelta;
result += Math.Atan(value);
}
var diff = Math.Abs(atanDoubleExpectedResult - result);
if (diff > doubleEpsilon)
{
throw new Exception($"Expected Result {atanDoubleExpectedResult,20:g17}; Actual Result {result,20:g17}");
}
}
}
}
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