in reply to How to test caching?

  1. Use the perl debugger.
  2. Have some sentinel value (eg "I CAN HAS CASH PLZ.", or a SHA1) that dumps the cache instead of executing your expensive subroutine.
  3. Move state out of the subroutine while testing. Or something like

    {
    my %cache;

    sub foo { ... }

    sub dump_foo {
        require Data::Dumper;
        print Data::Dumper::Dumper(\%cache);
    }
}

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