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our %EXPORT_TAGS = ( 'all' => [ qw(
    doubler
) ] );

use Integer::Doubler qw( doubler );
  -or-
use Integer::Doubler qw( :all );

BEGIN {
    use_ok 'Integer::Doubler', qw( doubler );
      -or-
    use_ok 'Integer::Doubler', qw( :all );
}

print "2 * 2 =", doubler(2);

is( doubler(2), 2*2, 'doubler(2)' );

use Test::More tests => 2;