diff --git a/t/plugin/auth-oauth.t b/t/plugin/auth-oauth.t
index 63c1df2..b07645e 100644
--- a/t/plugin/auth-oauth.t
+++ b/t/plugin/auth-oauth.t
@@ -772,6 +772,16 @@
   ->text_is('div.notify-error', 'Some fields are invalid')
   ;
 
+# OAuth client authorization flow
+$t->get_ok(Mojo::URL->new('/settings/oauth/authorize?client_id=abc'))
+  ->status_is(302)
+  ->header_is('location','/settings/oauth')
+  ;
+
+$t->get_ok('/settings/oauth/')
+  ->text_is('div.notify-error', 'Unknown client with abc.')
+  ;
+
 # Logout
 $t->get_ok('/x/expired-with-wrong-refresh');
 
diff --git a/t/server/mock.pl b/t/server/mock.pl
index 3c1f74f..ab0c34d 100644
--- a/t/server/mock.pl
+++ b/t/server/mock.pl
@@ -53,7 +53,7 @@
 helper 'add_client' => sub {
   my $c = shift;
   my $client = shift;
-  my $list = $c->app->defaults('oauth.client_list');
+  my $list = $c->stash('oauth.client_list');
   push @$list, $client;
 };
 
@@ -579,6 +579,47 @@
   );
 };
 
+# Get client info
+post '/v1.0/oauth2/client/:client_id' => sub {
+  my $c = shift;
+
+  # Validate input
+  my $v = $c->validation;
+  $v->required('super_client_id');
+  $v->required('super_client_secret');
+
+  if ($v->has_error) {
+    return $c->render(
+      status => 400,
+      json => {
+        error_description => "No super client",
+        error => "no_superclient"
+      }
+    );
+  };
+
+  my $client_id = $c->stash('client_id');
+
+  my $list = $c->stash('oauth.client_list');
+
+  foreach (@$list) {
+    if ($_->{client_id} eq $client_id) {
+      return $c->render(
+        json => $_,
+        status => 200
+      );
+    };
+  };
+
+  return $c->render(
+    json => {
+      error_description => "Unknown client with $client_id.",
+      error => "invalid_client"
+    },
+    status => 401
+  );
+};
+
 
 # Get token list
 post '/v1.0/oauth2/token/list' => sub {