I needed to be able to check that two hashes have the same contents as part of a test suite. A Super Search turned up How to test equality of hashes? which has answers for the equality bit, but doesn't address the reporting bit.

The following code uses List::Compare::Functional to assist in comparing two hashes and reporting differences between them. Note that the application specific warning strings may need to be adjusted for your context. :-)

use List::Compare::Functional qw(get_unique get_complement);


sub hashesEqual {
    my ($have, $want) = @_;
    my @keysHave = sort keys %$have;
    my @keysWant = sort keys %$want;
    my @haveOnly = get_unique ([\@keysHave, \@keysWant]);
    my @wantOnly = get_complement ([\@keysHave, \@keysWant]);
    
    if (@haveOnly) {
        warn 'Unexpected parameters ' . (join ',', @haveOnly) . " for 
+email send\n";
        return;
    }
    
    if (@wantOnly) {
        warn 'Expected parameters ' . (join ',', @haveOnly) . " missin
+g for email send\n";
        return;
    }
    
    my $ok = 1;
    for (@keysHave) {
        next if $have->{$_} eq $want->{$_};
        $ok = undef;
        warn "Email send parameter $_ expected '$want->{$_}', got '$ha
+ve->{$_}'\n";
    }
    
    return $ok;
}

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In reply to Testing hash equality and reporting differences by GrandFather

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