public void IncrementsWhileRunning()
{
var sleepTimeMs = 5;
var timer = new StopwatchTraceTimer();
Thread.Sleep(5);
var initialTimeNs = timer.ElapsedNanoseconds;
timer.Start();
Thread.Sleep(sleepTimeMs);
timer.Stop();
var afterFirstStop1 = timer.ElapsedNanoseconds;
Thread.Sleep(sleepTimeMs);
var afterFirstStop2 = timer.ElapsedNanoseconds;
timer.Start();
Thread.Sleep(sleepTimeMs);
timer.Stop();
var afterSecondStop = timer.ElapsedNanoseconds;
initialTimeNs.Should().Be(0, "the timer should remain at 0 until started.");
afterFirstStop1.Should().BeGreaterThan(initialTimeNs, "the timer should increment while running.");
afterFirstStop2.Should().Be(afterFirstStop1, "the timer should not increment while stopped.");
afterSecondStop.Should().BeGreaterThan(afterFirstStop2, "the timer should increment while running.");
}
public void Elapsed_And_ElapsedNanoseconds_ShouldBeEquivalent()
{
var stopwatchNanosecondsPerTick = 1_000_000_000L / Stopwatch.Frequency;
var timeSpanNanosecondsPerTick = 1_000_000_000L / TimeSpan.TicksPerSecond;
var timer = new StopwatchTraceTimer();
timer.Start();
Thread.Sleep(5);
timer.Stop();
var timeSpanNanoseconds = timer.Elapsed.TotalMilliseconds * 1_000_000D;
var delta = stopwatchNanosecondsPerTick == timeSpanNanosecondsPerTick
? 0
: (ulong)(Math.Max(stopwatchNanosecondsPerTick / timeSpanNanosecondsPerTick, timeSpanNanosecondsPerTick / stopwatchNanosecondsPerTick));
timer.ElapsedNanoseconds.Should().BeCloseTo((long)(timeSpanNanoseconds), delta);
}