Hello, I'm trying to write some test code for the subroutine ScanDeps however, I'm seeing some odd behaviour that I can't explain. A cut-down version of my test code looks like this: 
sub generic_rv_test {
    my $rv = shift;

    foreach my $key (keys %$rv) {
        if (exists($rv->{$key}{used_by})) {
            # test used_by ...
        } else {
            # fail test
        }
    }
}  

my $rv = scan_deps(
    files   => ['t/data/pluggable/Foo.pm'],
    recurse => 1,
);
generic_rv_test($rv);

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However, my test was failing so I added the following lines after generic_rv_test($rv); to start debugging the issue: 
use Data::Dump qw(dump);
print dump $rv;

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However, adding these lines somehow caused my test to start working! What seems to be happening is that $rv is more complete with the dump lines than without. Can someone explain what is happening? Basically, I want to be able to ensure $rv is contains all it's information before calling the test function on it but without having to dump $rv ...

$rv without the dump lines: 

{
  "Pluggable.pm" => {
                      file => "C:/Perl/site/lib/Module/Pluggable.pm",
                      key  => "Module/Pluggable.pm",
                      type => "module",
                    },
}

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$rv with the dump lines: 
{
  "Pluggable.pm" => {
                      file => "C:/Perl/site/lib/Module/Pluggable.pm",
                      key  => "Module/Pluggable.pm",
                      type => "module",
                      used_by => ["Foo.pm"],
                    },
}

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Thanks, AdrianI

In reply to Problem: Lazy Hash Evaluation by adriani

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