diff --git a/t/extra.conf.2.in b/t/extra.conf.2.in
index d2e5c03..d0e2770 100644
--- a/t/extra.conf.2.in
+++ b/t/extra.conf.2.in
@@ -346,6 +346,24 @@ TKTAuthDigestType "MD5"
   TKTAuthGuestFallback on
 </Location>
 
+# secret_back_explicit - explicit TKTAuthBackArgName
+<Location /secret_back_explicit>
+  AuthType None
+  require valid-user
+  TKTAuthLoginURL http://localhost/pub/login.cgi
+  TKTAuthBackArgName redirect_to
+  TKTAuthDebug 2
+</Location>
+
+# secret_back_none - null TKTAuthBackArgName
+<Location /secret_back_none>
+  AuthType None
+  require valid-user
+  TKTAuthLoginURL http://localhost/pub/login.cgi
+  TKTAuthBackArgName None
+  TKTAuthDebug 2
+</Location>
+
 # virtual host testing - with per-host secret
 <VirtualHost VHostLocalSecret>
   DocumentRoot @documentroot@/vhost_local_secret