public void TestPurge()
{
QueueChannel channel = new QueueChannel(2);
TimeSpan minute = new TimeSpan(0, 0, 1, 0);
DateTime now = DateTime.Now;
DateTime past = now.Subtract(minute);
DateTime future = now.Add(minute);
IMessage expiredMessage = MessageBuilder.WithPayload("test1").SetExpirationDate(past).Build();
IMessage unexpiredMessage = MessageBuilder.WithPayload("test2").SetExpirationDate(future).Build();
Assert.IsTrue(channel.Send(expiredMessage, TimeSpan.Zero));
Assert.IsTrue(channel.Send(unexpiredMessage, TimeSpan.Zero));
Assert.IsFalse(channel.Send(new StringMessage("atCapacity"), TimeSpan.Zero));
IList<IMessage> purgedMessages = channel.Purge(new UnexpiredMessageSelector());
Assert.IsNotNull(purgedMessages);
Assert.That(purgedMessages.Count, Is.EqualTo(1));
Assert.IsTrue(channel.Send(new StringMessage("roomAvailable"), TimeSpan.Zero));
}