#!/usr/bin/perl
use warnings;
use strict;

{   package MyPackage;

    sub method1 { '<?xml version="1.0"?>' }

    sub method2 { '[?xml version="2.0"?][a][/a]' }

}


use Test::More;

sub my_subtest {
    like( shift, qr/xml version=/, "XML Document");
   # more tests on XML document text here....
}

for my $method (qw/method1 method2/) {
    subtest "Checking $method" => sub { my_subtest(MyPackage->$method) };
}