public void PEXPIRE_PTTL()
{
long dt = -1;
StringKey key = "HENRY_EMAIL";
key.Set("*****@*****.**");
key.PExpire(2000);
long value = key.PTTL();
Assert.AreNotEqual(value, 0);
System.Threading.Thread.Sleep(2000);
value = key.PTTL();
Assert.AreEqual(value, dt);
}