Use existing category in backup_and_restore test

tests/backup_and_restore_workflow_test.php

@@ -28,6 +28,7 @@
 require_once(__DIR__ . '/generator/lib.php');
 require_once(__DIR__ . '/../lib.php');
 
+use mod_bigbluebuttonbn\settings;
 use tool_lifecycle\local\backup\backup_lifecycle_workflow;
 use tool_lifecycle\local\backup\restore_lifecycle_workflow;
 use tool_lifecycle\local\manager\workflow_manager;
@@ -60,6 +61,14 @@ public function setUp() : void {
         $this->resetAfterTest(true);
         $generator = $this->getDataGenerator()->get_plugin_generator('tool_lifecycle');
         $this->workflow = $generator->create_workflow(['startdatedelay', 'categories'], ['email', 'createbackup', 'deletecourse']);
+        $category = $this->getDataGenerator()->create_category();
+        foreach (trigger_manager::get_triggers_for_workflow($this->workflow->id) as $trigger) {
+            if ($trigger->subpluginname === 'categories') {
+                settings_manager::save_setting($trigger->id, settings_type::TRIGGER, 'categories',
+                        'categories', $category->id);
+            }
+        }
+
         foreach (workflow_manager::get_workflows() as $existingworkflow) {
             $this->existingworkflows[] = $existingworkflow->id;
         }