diff --git a/backend/src/test/java/core/schedules/ScheduleServiceTest.java b/backend/src/test/java/core/schedules/ScheduleServiceTest.java
index c80452a..737de26 100644
--- a/backend/src/test/java/core/schedules/ScheduleServiceTest.java
+++ b/backend/src/test/java/core/schedules/ScheduleServiceTest.java
@@ -161,6 +161,10 @@ public class ScheduleServiceTest {
         ServiceResult<AbstractSchedule> result_3 = taskScheduleService.scheduleNow(entityManager.find(Task.class, 5L));
         assertEquals(ServiceExitCode.OK, result_3.getExitCode());
         assertThat(entityManager.find(BasicTaskSchedule.class, result_3.getResult().getScheduleID())).isNotNull();
+
+        //Situation 4: Running Advanced Schedule
+        ServiceResult<AbstractSchedule> result_4 = taskScheduleService.scheduleNow(entityManager.find(Task.class, 17L));
+        assertEquals(ServiceExitCode.ENTITY_ALREADY_EXIST, result_4.getExitCode());
     }
 
     @Test