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$ ./sample.pl my-dev-1
---
classes:
  - all
  - dev

#!/usr/bin/perl

...
        classes => \@classes,
    }
);

#!/usr/bin/perl

...
", 'check usage message');

done_testing();

$ ./test.pl 
1..2
...

    [ -h ]    print this help message 
ok 2 - check usage message