public async Task BasicTest()
{
var epsilon = TimeSpan.FromSeconds(1);
var epsilon10 = epsilon * 10;
using var clock = new TestClock().SpeedupBy(10).OffsetBy(1000);
var realStart = SystemClock.Now;
var clockStart = clock.Now;
ShouldEqual(realStart, DateTime.Now.ToMoment(), epsilon);
ShouldEqual(realStart, clock.ToRealTime(clockStart), epsilon);
ShouldEqual(clockStart, clock.ToLocalTime(realStart), epsilon10);
ShouldEqual(clockStart, realStart + TimeSpan.FromSeconds(1), epsilon);
await clock.DelayAsync(TimeSpan.FromSeconds(5));
ShouldEqual(realStart + TimeSpan.FromSeconds(0.5), SystemClock.Now, epsilon);
ShouldEqual(clockStart + TimeSpan.FromSeconds(5), clock.Now, epsilon10);
Out.WriteLine(clock.Now.ToString());
clock.OffsetBy(1000);
ShouldEqual(clockStart + TimeSpan.FromSeconds(6), clock.Now, epsilon10);
clock.SpeedupBy(0.1);
await clock.DelayAsync(TimeSpan.FromSeconds(0.5));
ShouldEqual(realStart + TimeSpan.FromSeconds(1), SystemClock.Now, epsilon);
ShouldEqual(clockStart + TimeSpan.FromSeconds(6.5), clock.Now, epsilon10);
}