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....
  $self->tmpl_path(
...
        ]
    );
...

   my $tmpl = $self->load_tmpl('login.tmpl')
        or die "Failed to open template file 'login.tmpl'";

use Test::Exception;
...
...
    $app->tmpl_path( [] );
    dies_ok { $app->run() } 'dies if missing template file';
}