Fair enough, here it all is, shortened as short as possible:

Contents of MyFile.pm

#!/usr/bin/env perl
use warnings;
use strict;
use feature ':5.10';

package ThatPackage;

sub parse { } # Yep, even empty the error occurs, because it never eve
+n gets as far as calling it
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Contents of unit_test.pl

#!/usr/bin/env perl -w
use feature ':5.10';
use Test::More 'no_plan';

require 'MyFile.pm';
my $foo = "blah";
my $bar = " blah";

ok( ThatPackage::parse $foo, " this is a test" ); # fine, test doesn't
+ pass but runs fine
ok( ThatPackage::parse($bar), " this is a test" ); # also fine
ok( ThatPackage::parse $bar, " this is a test" ); # error here: 'Can't
+ call method "ThatPackage::parse" without a package or object referen
+ce at unit_test.pl line 43.'
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