public void TestChoice()
{
SmartThreadPool stp = new SmartThreadPool();
int index = stp.Choice(
() => Thread.Sleep(1000),
() => Thread.Sleep(1500),
() => Thread.Sleep(500));
Assert.AreEqual(2, index);
index = stp.Choice(
() => Thread.Sleep(300),
() => Thread.Sleep(100),
() => Thread.Sleep(200));
Assert.AreEqual(1, index);
stp.Shutdown();
}