public void Where()
{
var chan = new Chan<int>();
chan
.Send(Enumerable.Range(0, 10))
.ContinueWith(t => chan.Close());
var counting =
chan
.Where(item => item % 2 == 0)
.Count();
if (!counting.Wait(TimeSpan.FromSeconds(10)))
{
Assert.Fail();
}
Assert.AreEqual(5, counting.Result);
}