public async Task Generate_Works()
{
var sng = new SequenceNumberGenerator();
var current = sng.Generate();
var currentUL = ulong.Parse(current);
await Task.Delay(TimeSpan.FromSeconds(1));
var next = sng.Generate();
var nextUL = ulong.Parse(next);
Assert.Equal(1UL, nextUL - currentUL);
}