System.IO.Tests.ManuallyReleaseAsyncOperationsStream.SetCanSeek C# (CSharp) Method

        public void SetCanSeek(bool canSeek) => _canSeek = canSeek;

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

            var wrapped = new ManuallyReleaseAsyncOperationsStream();

            wrapped.Release();
            wrapped.Write(data, 0, data.Length);
            wrapped.Position = 0;
            wrapped.SetCanSeek(wrappedStreamCanSeek);
            var src = new BufferedStream(wrapped, 100);

            src.ReadByte();

            var dst = new MemoryStream();

            if (copyAsynchronously)
            {
                await src.CopyToAsync(dst);
            }
            else
            {
                src.CopyTo(dst);
            }

            var expected = new byte[data.Length - 1];

            Array.Copy(data, 1, expected, 0, expected.Length);
            Assert.Equal(expected, dst.ToArray());
        }