If you look at the error message of this report for perl 5.22 http://www.cpantesters.org/cpan/report/0fe4cebc-ba81-11e8-8adf-d931f47900cc
you will see that it's running perl 5.20:
# Can't locate Getopt/Args.pm in @INC (you may need to install the Get
+opt::Args module) (@INC contains: .... /etc/perl /usr/local/lib/x86_6
+4-linux-gnu/perl/5.20.2 /usr/local/share/perl/5.20.2 /usr/lib/x86_64-
+linux-gnu/perl5/5.20 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/
+5.20 /usr/share/perl/5.20 /usr/local/lib/site_perl .) at /tmpfs/.cpan
+m line 6.
Similar results for other versions.
In your test you need to call $^X
instead of perl
Even if the tester is running the tests with a specific perl version, this perl might not be in their path.
Also you should replace /usr/bin/env perl
. It will be replaced with the path to perl it was installed with.