1..1 Entity: line 1: parser error : ParsePI: PI xm space expected ^ # Looks like your test exited with 255 before it could output anything. #### use strict; use warnings; use Test::More tests => 1; use Test::XML::Ordered 'is_xml_ordered'; my $parser1 = XML::LibXML->new(); my $expected = $parser1->parse_file( $ARGV[0] ); my $parser2 = XML::LibXML->new(); my $actual = $parser2->parse_file( $ARGV[1] ); is_xml_ordered( [string => $actual], [string => $expected], {}, 'Test $got_good' );