How do you test code that uses avoiding unnecessary copying?

Testing code that avoids unnecessary copying is essential for maximizing efficiency and performance in software applications. Below is an example illustrating how to use references in Perl to manipulate data without incurring the overhead of copying data structures.


        # Perl script example: Avoiding unnecessary copying
        my @array = (1, 2, 3, 4, 5);
        
        # Using a reference to avoid copying
        my $array_ref = \@array;
        
        # Modifying the original array through the reference
        push @$array_ref, 6;

        print "@array";  # Output: 1 2 3 4 5 6