diff --git a/t/extra.conf.1.in b/t/extra.conf.1.in
index 3466a93..7fac764 100644
--- a/t/extra.conf.1.in
+++ b/t/extra.conf.1.in
@@ -240,6 +240,24 @@ 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>
   TKTAuthSecret "vhostlocalsecret"