public void TestContains()
        {
            var buffer = Encoding.ASCII.GetBytes("Hello  \tworld.!");
            var slice = new BufferSlice(buffer, 0, buffer.Length);
            var reader = new StringBufferSliceReader(slice, slice.Count);

            reader.Contains(' ');
            Assert.Equal('H', reader.Current);
            Assert.Equal('e', reader.Peek);
        }