fixed test

Author: sterlp

core/src/test/java/org/sterl/spring/persistent_tasks/TaskSchedulerServiceTest.java

@@ -31,8 +31,7 @@ public RetryStrategy retryStrategy() {
         var runTrigger = triggerService.queue(task.newTrigger().state("hallo").build());
 
         // WHEN
-        persistentTaskTestService.assertHasNextTask();
-        persistentTaskTestService.assertHasNextTask();
+        persistentTaskTestService.scheduleNextTriggersAndWait(Duration.ofSeconds(3));
 
         // THEN
         assertThat(asserts.getCount("hallo")).isEqualTo(4);