System.IO.Tests.BufferedStream_StreamAsync.ConcurrentOperationsAreSerialized C# (CSharp) Méthode

        public async Task ConcurrentOperationsAreSerialized()
        {
            byte[] data = Enumerable.Range(0, 1000).Select(i => (byte)i).ToArray();
            var mcaos = new ManuallyReleaseAsyncOperationsStream();
            var stream = new BufferedStream(mcaos, 1);

            var tasks = new Task[4];
            for (int i = 0; i < 4; i++)
            {
                tasks[i] = stream.WriteAsync(data, 250 * i, 250);
            }
            Assert.False(tasks.All(t => t.IsCompleted));

            mcaos.Release();
            await Task.WhenAll(tasks);

            stream.Position = 0;
            for (int i = 0; i < tasks.Length; i++)
            {
                Assert.Equal(i, stream.ReadByte());
            }
        }