Inspired in part by Lessons learned from getting to 100% with Devel::Cover I'm trying to get 100% coverage with Devel::Cover in our CGI::Application code. I'm using Test::Class. I'm trying to test the a run mode. In  cgiapp_prerun We do:

....
  $self->tmpl_path(
        [   $ENV{MV_CUSTOM_HTML_TEMPLATE_DIR},
            $ENV{MV_DEFAULT_HTML_TEMPLATE_DIR}
        ]
    );
...
[download]

The code I'm trying to get coverage for is in a run mode:

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

use Test::Exception;
...
sub show_login_page : Tests(1) {
    my $app = shift->{rm_show_login_page};
    $app->tmpl_path( [] );
    dies_ok { $app->run() } 'dies if missing template file';
}
[download]

If I don't want to mix testing bits into my actual code, do I have an alternative to mucking with the private bits of my CGI::Application object to set $_TEMPLATE_PATH=[]

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