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    # Set up values to be tested
    ...
...

    my ($value, $type) = $mech->eval_in_page('validateIpSettings()');
    is($value, 'some expected value');

    # create myalert as Javascript function
    my $myalert = $mech->declare(<<JS);
...
JS

    my ($value, $type) = $mech->eval_in_page('validateIpSettings()', {
+ alert => $myalert });