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$test_subscriptions->{"test_case-$j"} = ['news','updates','vols-annc']
+;

$test_subscriptions->{"test_case-$j"} = [
          'fname' => $lname,
...
          'email' => $email,
          'lists' => ['news','updates','vols-annc'],
    ];

$test_subscriptions->{"test_case-$j"} = {
          'fname' => $lname,
...
          'email' => $email,
          'lists' => ['news','updates','vols-annc'],
    };