public async Task SynchronousReadsThrowIfDisallowedByIHttpBodyControlFeature()
{
var allowSynchronousIO = false;
var mockBodyControl = new Mock <IHttpBodyControlFeature>();
mockBodyControl.Setup(m => m.AllowSynchronousIO).Returns(() => allowSynchronousIO);
var mockMessageBody = new Mock <MessageBody>((Frame)null);
mockMessageBody.Setup(m => m.ReadAsync(It.IsAny <ArraySegment <byte> >(), CancellationToken.None)).ReturnsAsync(0);
var stream = new FrameRequestStream(mockBodyControl.Object);
stream.StartAcceptingReads(mockMessageBody.Object);
Assert.Equal(0, await stream.ReadAsync(new byte[1], 0, 1));
var ioEx = Assert.Throws <InvalidOperationException>(() => stream.Read(new byte[1], 0, 1));
Assert.Equal("Synchronous operations are disallowed. Call ReadAsync or set AllowSynchronousIO to true instead.", ioEx.Message);
var ioEx2 = Assert.Throws <InvalidOperationException>(() => stream.CopyTo(Stream.Null));
Assert.Equal("Synchronous operations are disallowed. Call ReadAsync or set AllowSynchronousIO to true instead.", ioEx2.Message);
allowSynchronousIO = true;
Assert.Equal(0, stream.Read(new byte[1], 0, 1));
}