BenchmarkTests.cs

using System;
using System.Diagnostics;
using System.Text;
using NUnit.Framework;

namespace StructBenchmarking
{
    [TestFixture]
    public class BenchmarkTests
    {
        public class MockTask : ITask
        {
            private readonly double firstCallDelay;
            private readonly double delay;
            public int CallsCount { get; private set; }

            public MockTask(double firstCallDelay, double delay)
            {
                this.firstCallDelay = firstCallDelay;
                this.delay = delay;
            }

            public void Run()
            {
                var realDelay = CallsCount == 0 ? firstCallDelay : delay;
                CallsCount++;
                var sw = Stopwatch.StartNew();
                while (true)
                    if (sw.ElapsedMilliseconds >= realDelay)
                        return;
            }
        }

        [Test]
        public void HasExtraWarmingCall([Values(10, 20, 30)] int repetitionsCount)
        {
            var runner = new MockTask(firstCallDelay: 0, delay: 0);
            var benchmark = new Benchmark();
            benchmark.MeasureDurationInMs(runner, repetitionsCount);
            Assert.AreEqual(repetitionsCount + 1, runner.CallsCount);
        }

        [TestCase(1, 10)]
        [TestCase(5, 20)]
        public void MeasureTimeExceptWarmingCall(int repetitionsCount, int delay)
        {
            var runner = new MockTask(firstCallDelay: 10 * delay, delay: delay);
            var benchmark = new Benchmark();
            var measure = benchmark.MeasureDurationInMs(runner, repetitionsCount);
            Assert.AreEqual(delay, measure, delay / 4.0);
        }
    }
}