How about some sample code? While I understand tye's sample, I fail to see how I can replace return $new->( @_ }; with a goto to accomplish the same result. How would the following change?

sub MIME::Lite::new {
    my ($self, %params) = @_;

    ok (exists $params{To}, 'To address present');
    ok ($params{To} eq 'wibble@wobble', 'To address correct');
    ...
    return $new->( @_ );
}

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DWIM is Perl's answer to Gödel

In reply to Re^3: Checking parameters passed to a third party module during testing (wrap) by GrandFather
in thread Checking parameters passed to a third party module during testing by GrandFather

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