Catel.Test.FastDateTimeFacts.ValidateDateTimeRetrieval C# (CSharp) Метод

        private async Task ValidateDateTimeRetrieval(Func<DateTime> normal, Func<DateTime> fast)
        {
            var normalNow1 = normal();
            var fastNow1 = fast();

            var delta1 = fastNow1 - normalNow1;
            if (delta1 < TimeSpan.Zero)
            {
                delta1 = TimeSpan.FromMilliseconds(delta1.TotalMilliseconds * -1);
            }

            Assert.IsTrue(delta1.TotalMilliseconds < 15);

            await TaskShim.Delay(5000);

            var normalNow2 = normal();
            var fastNow2 = fast();

            var delta2 = fastNow2 - normalNow2;
            if (delta2 < TimeSpan.Zero)
            {
                delta2 = TimeSpan.FromMilliseconds(delta2.TotalMilliseconds * -1);
            }

            Assert.IsTrue(delta2.TotalMilliseconds < 15);
        }
    }