sub _dup_stdhandles {
    my $self = shift;
    
    print STDERR "\n\n******* [chkpt1]BrowserUk diagnostic STDOUT fileno: ",fileno(STDOUT)," *******\n\n";
    
    $self->_open_testhandles;

    # Set everything to unbuffered else plain prints to STDOUT will
    # come out in the wrong order from our own prints.
    _autoflush($Testout);
    _autoflush( \*STDOUT );
    _autoflush($Testerr);
    _autoflush( \*STDERR );

    $self->reset_outputs;

    return;
}

sub _open_testhandles {
    my $self = shift;

    return if $self->{Opened_Testhandles};

    print STDERR "\n\n******* [chkpt2]BrowserUk diagnostic STDOUT fileno: ",fileno(STDOUT)," *******\n\n";
    
    # We dup STDOUT and STDERR so people can change them in their
    # test suites while still getting normal test output.
    open( $Testout, ">&STDOUT" ) or die "Can't dup STDOUT:  $!";
    open( $Testerr, ">&STDERR" ) or die "Can't dup STDERR:  $!";

    $self->_copy_io_layers( \*STDOUT, $Testout );
    $self->_copy_io_layers( \*STDERR, $Testerr );

    $self->{Opened_Testhandles} = 1;

    return;
}