+ my $psgi = "$tmpdir/pfx.psgi";
+ {
+ open my $psgi_fh, '>', $psgi or xbail "open: $!";
+ print $psgi_fh <<'EOM' or xbail "print $!";
+use PublicInbox::WWW;
+use Plack::Builder;
+my $www = PublicInbox::WWW->new;
+builder {
+ enable 'Head';
+ mount '/pfx/' => sub { $www->call(@_) }
+}
+EOM
+ close $psgi_fh or xbail "close: $!";
+ }
+
+ # ensure prefixed mount full clones work:
+ $td = start_script([@$cmd, $psgi], $env, { 3 => $sock });
+ my $opt = { 2 => \(my $clone_err = '') };
+ ok(run_script(['-clone', "http://$host:$port/pfx", "$tmpdir/pfx" ],
+ undef, $opt), 'pfx clone w/pfx') or diag "clone_err=$clone_err";
+ undef $td;
+