public async Task WebSocketDisposalThrowsOnPeer()
        {
            // Arrange
            RequestDelegate appDelegate = async ctx =>
            {
                if (ctx.WebSockets.IsWebSocketRequest)
                {
                    var websocket = await ctx.WebSockets.AcceptWebSocketAsync();
                    websocket.Dispose();
                }
            };
            var builder = new WebApplicationBuilder().Configure(app =>
            {
                app.Run(appDelegate);
            });
            var server = new TestServer(builder);

            // Act
            var client = server.CreateWebSocketClient();
            var clientSocket = await client.ConnectAsync(new System.Uri("http://localhost"), CancellationToken.None);
            var buffer = new byte[1024];
            await Assert.ThrowsAsync<IOException>(async () => await clientSocket.ReceiveAsync(new System.ArraySegment<byte>(buffer), CancellationToken.None));

            clientSocket.Dispose();
        }
        public async Task WebSocketTinyReceiveGeneratesEndOfMessage()
        {
            // Arrange
            RequestDelegate appDelegate = async ctx =>
            {
                if (ctx.WebSockets.IsWebSocketRequest)
                {
                    var websocket = await ctx.WebSockets.AcceptWebSocketAsync();
                    var receiveArray = new byte[1024];
                    while (true)
                    {
                        var receiveResult = await websocket.ReceiveAsync(new System.ArraySegment<byte>(receiveArray), CancellationToken.None);
                        var sendBuffer = new System.ArraySegment<byte>(receiveArray, 0, receiveResult.Count);
                        await websocket.SendAsync(sendBuffer, receiveResult.MessageType, receiveResult.EndOfMessage, CancellationToken.None);
                    }
                }
            };
            var builder = new WebApplicationBuilder().Configure(app =>
            {
                app.Run(appDelegate);
            });
            var server = new TestServer(builder);

            // Act
            var client = server.CreateWebSocketClient();
            var clientSocket = await client.ConnectAsync(new System.Uri("http://localhost"), CancellationToken.None);
            var hello = Encoding.UTF8.GetBytes("hello");
            await clientSocket.SendAsync(new System.ArraySegment<byte>(hello), WebSocketMessageType.Text, true, CancellationToken.None);

            // Assert
            var buffer = new byte[1];
            for (var i = 0; i < hello.Length; i++)
            {
                bool last = i == (hello.Length - 1);
                var result = await clientSocket.ReceiveAsync(new System.ArraySegment<byte>(buffer), CancellationToken.None);
                Assert.Equal(buffer.Length, result.Count);
                Assert.Equal(buffer[0], hello[i]);
                Assert.Equal(last, result.EndOfMessage);
            }

            clientSocket.Dispose();
        }
        public async Task WebSocketWorks()
        {
            // Arrange
            RequestDelegate appDelegate = async ctx =>
            {
                if (ctx.WebSockets.IsWebSocketRequest)
                {
                    var websocket = await ctx.WebSockets.AcceptWebSocketAsync();
                    var receiveArray = new byte[1024];
                    while (true)
                    {
                        var receiveResult = await websocket.ReceiveAsync(new System.ArraySegment<byte>(receiveArray), CancellationToken.None);
                        if (receiveResult.MessageType == WebSocketMessageType.Close)
                        {
                            await websocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "Normal Closure", CancellationToken.None);
                            break;
                        }
                        else
                        {
                            var sendBuffer = new System.ArraySegment<byte>(receiveArray, 0, receiveResult.Count);
                            await websocket.SendAsync(sendBuffer, receiveResult.MessageType, receiveResult.EndOfMessage, CancellationToken.None);
                        }
                    }
                }
            };
            var builder = new WebApplicationBuilder().Configure(app =>
            {
                app.Run(appDelegate);
            });
            var server = new TestServer(builder);

            // Act
            var client = server.CreateWebSocketClient();
            var clientSocket = await client.ConnectAsync(new System.Uri("http://localhost"), CancellationToken.None);
            var hello = Encoding.UTF8.GetBytes("hello");
            await clientSocket.SendAsync(new System.ArraySegment<byte>(hello), WebSocketMessageType.Text, true, CancellationToken.None);
            var world = Encoding.UTF8.GetBytes("world!");
            await clientSocket.SendAsync(new System.ArraySegment<byte>(world), WebSocketMessageType.Binary, true, CancellationToken.None);
            await clientSocket.CloseOutputAsync(WebSocketCloseStatus.NormalClosure, "Normal Closure", CancellationToken.None);

            // Assert
            Assert.Equal(WebSocketState.CloseSent, clientSocket.State);

            var buffer = new byte[1024];
            var result = await clientSocket.ReceiveAsync(new System.ArraySegment<byte>(buffer), CancellationToken.None);
            Assert.Equal(hello.Length, result.Count);
            Assert.True(hello.SequenceEqual(buffer.Take(hello.Length)));
            Assert.Equal(WebSocketMessageType.Text, result.MessageType);

            result = await clientSocket.ReceiveAsync(new System.ArraySegment<byte>(buffer), CancellationToken.None);
            Assert.Equal(world.Length, result.Count);
            Assert.True(world.SequenceEqual(buffer.Take(world.Length)));
            Assert.Equal(WebSocketMessageType.Binary, result.MessageType);

            result = await clientSocket.ReceiveAsync(new System.ArraySegment<byte>(buffer), CancellationToken.None);
            Assert.Equal(WebSocketMessageType.Close, result.MessageType);
            Assert.Equal(WebSocketState.Closed, clientSocket.State);

            clientSocket.Dispose();
        }