public void ReadPreviousChar()
{
var str = "Hello World!";
using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(str)))
using (var bs = new BencodeStream(ms))
{
Assert.Equal(default(char), bs.ReadPreviousChar());
bs.Read(1);
Assert.Equal('H', bs.ReadPreviousChar());
}
}