@Test public void unread2()
{
PeekInputStream in = make("abc") ;
checkLineCol(in, INIT_LINE, INIT_COL) ;
int ch = in.readByte() ;
// Pushback does not move line/col backwards.
checkLineCol(in, INIT_LINE, INIT_COL+1) ;
assertEquals('b', in.peekByte()) ;
checkLineCol(in, INIT_LINE, INIT_COL+1) ;
in.pushbackByte('a') ;