IronRuby.Builtins.RubyBufferedStream.PeekByte C# (CSharp) Method

        public int PeekByte() {
            return PeekByte(0);
        }

        public void File_AppendBytes1()
        {
            string s;
            string crlf = "\r\n";
            var stream = new TestStream(false, B(
                "ab\r\r\n" +
                "e" + (s = "fgh" + crlf + "ijkl" + crlf + "mnop" + crlf + crlf + crlf + crlf + "qrst") +
                crlf + "!"
            ));
            int s_crlf_count = 6;

            var io = new RubyBufferedStream(stream);
            Assert(io.PeekByte() == (byte)'a');

            var buffer = MutableString.CreateBinary(B("foo:"));
            Assert(io.AppendBytes(buffer, 4, false) == 4);
            Assert(buffer.ToString() == "foo:ab\r\n");

            buffer = MutableString.CreateBinary();
            Assert(io.AppendBytes(buffer, 1, false) == 1);
            Assert(buffer.ToString() == "e");

            buffer = MutableString.CreateMutable("x:", RubyEncoding.Binary);
            int c = s.Length - s_crlf_count - 2;
            Assert(io.AppendBytes(buffer, c, false) == c);
            Assert(buffer.ToString() == "x:" + s.Replace(crlf, "\n").Substring(0, c));

            buffer = MutableString.CreateBinary();
            Assert(io.AppendBytes(buffer, 10, false) == 4);
            Assert(buffer.ToString() == "st\n!");

            buffer = MutableString.CreateBinary();
            Assert(io.AppendBytes(buffer, 10, false) == 0);
            Assert(buffer.ToString() == "");

            stream = new TestStream(false, B(s = "abcd" + crlf + "xyz" + crlf + "qqq;"));
            io = new RubyBufferedStream(stream);
            buffer = MutableString.CreateBinary();
            Assert(io.AppendBytes(buffer, Int32.MaxValue, true) == s.Length);
            io.BaseStream.Seek(0, SeekOrigin.Begin);
            Assert(io.AppendBytes(buffer, Int32.MaxValue, false) == s.Length - 2);
            Assert(buffer.ToString() == s + s.Replace(crlf, "\n"));
        }