System.IO.Tests.BufferedStream_StreamAsync.CopyToAsyncTest_RequiresAsyncFlushingOfWrites C# (CSharp) Method

        public async Task CopyToAsyncTest_RequiresAsyncFlushingOfWrites()
        {
            byte[] data = Enumerable.Range(0, 1000).Select(i => (byte)(i % 256)).ToArray();

            var manualReleaseStream = new ManuallyReleaseAsyncOperationsStream();
            var src = new BufferedStream(manualReleaseStream);
            src.Write(data, 0, data.Length);
            src.Position = 0;

            var dst = new MemoryStream();

            data[0] = 42;
            src.WriteByte(42);
            dst.WriteByte(42);

            Task copyTask = src.CopyToAsync(dst);
            manualReleaseStream.Release();
            await copyTask;

            Assert.Equal(data, dst.ToArray());
        }