public async Task CompleteAsyncTestAsync()
{
using var Stream = new PipelineStream();
Assert.AreEqual(0, Stream.Length);
Assert.IsTrue(Stream.CanRead);
Assert.IsTrue(Stream.CanWrite);
var WriteMessage1 = "HELLO";
await Stream.WriteAsync(Encoding.GetBytes(WriteMessage1));
await Stream.CompleteAsync();
await Stream.FlushAsync();
var ReadCount = Encoding.GetByteCount(WriteMessage1);
Assert.AreEqual(ReadCount, Stream.Length);
var ReadBytes = new byte[ReadCount];
ReadCount = await Stream.ReadAsync(ReadBytes);
var ReadMessage1 = Encoding.GetString(ReadBytes.AsSpan().Slice(0, ReadCount));
Assert.AreEqual(WriteMessage1, ReadMessage1);
Assert.IsTrue(Stream.CanRead);
Assert.IsFalse(Stream.CanWrite);
var WriteMessage2 = "HI!";
await Assert.ThrowsExceptionAsync <InvalidOperationException>(async() => await Stream.WriteAsync(Encoding.GetBytes(WriteMessage2)));
}