diff --git a/tests/potx.test b/tests/potx.test
index cdfc369..4817807 100644
--- a/tests/potx.test
+++ b/tests/potx.test
@@ -389,6 +389,7 @@ class PotxTestCase extends DrupalWebTestCase {
     $this->assertMsgID('Title potx_test_8_a');
     $this->assertMsgID('Description: potx_test_8_a');
     $this->assertMsgID('Title potx_test_8_b');
+    $this->assertNoMsgID('some_callback');
   }
 
   /**
diff --git a/tests/potx_test_8.permissions.yml b/tests/potx_test_8.permissions.yml
index e34dba3..f0bb2f3 100644
--- a/tests/potx_test_8.permissions.yml
+++ b/tests/potx_test_8.permissions.yml
@@ -1,4 +1,8 @@
 'potx_test_8 permission a':
   title: 'Title potx_test_8_a'
   description: 'Description: potx_test_8_a'
+
 potx_test_8_permission_b: 'Title potx_test_8_b'
+
+permission_callbacks:
+  - some_callback