Tests: Rely on admin user, groups, permissions from test setup script

tests/integration/api/forum/ShowTest.php

@@ -23,17 +23,8 @@ class ShowTest extends TestCase
 
         $this->prepareDatabase([
             'users' => [
-                $this->adminUser(),
                 $this->normalUser(),
-            ],
-            'groups' => [
-                $this->adminGroup(),
-                $this->memberGroup(),
-            ],
-            'group_user' => [
-                ['user_id' => 1, 'group_id' => 1],
-                ['user_id' => 2, 'group_id' => 3],
-            ],
+            ]
         ]);
     }