Well I'm not sure what snippet would work. This is running a set of scripts (total of about 8 to run this example) that are using objects to set up the environment depending on platform and OS. I already have some warnings placed in the code, as well as print statements for debugging.

The basic function is this:

sub getBinDir
{
     my $self = shift;
     if ( not exists $self->{'binDir'} )
     {
         warn "Object member binDir not set";
         return "";
     }
    $self->{'binDir'} = shift if @_;
     print "Returning binDir.\n";
     return $self->{'binDir'};
}
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It's located in the TestHarness.pm file, but called from UnixTestHarness.pm

sub copyCtestBinaries
{
    my $self = shift;
    my $binDir = $self->getBinDir();
    if ( $binDir eq '' )
    {
        warn "Could not set up C test binary area: $!\n";
        print "Received " . $self->getBinDir() . " for binDir.\n";
        return;
    }
    $binDir = $binDir . "\/*";
    print "BinDir = $binDir.\n";
    my $appBin = $self->app1() . "/bin";
    print "AppDir = $appBin.\n";
    `cp $binDir $appBin`;
}
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With the values set up in SolarisTestHarness.pm

sub new
{
    my $class = shift;
    # Pass the command line to the base class.
    my $self = $class->SUPER::new(@_);
    # Set OS specific defaults.
    $self->{'binDir'} = 'bin/solaris';
    bless ($self, $class);
    return $self;
}
[download]

One thing I did try, was to move the function to the SolarisTestHarness.pm file and set it there if its not set already. Which generated the following:
Can't locate object method "getBinDir" via package "SolarisTestHarness" at /opt/testharness/UnixTestHarness.pm line 90.