diff --git a/microsphere-java-core/src/test/java/io/microsphere/concurrent/DelegatingScheduledExecutorServiceTest.java b/microsphere-java-core/src/test/java/io/microsphere/concurrent/DelegatingScheduledExecutorServiceTest.java
index 47a6c9f51..11324f366 100644
--- a/microsphere-java-core/src/test/java/io/microsphere/concurrent/DelegatingScheduledExecutorServiceTest.java
+++ b/microsphere-java-core/src/test/java/io/microsphere/concurrent/DelegatingScheduledExecutorServiceTest.java
@@ -8,6 +8,7 @@
 import java.util.concurrent.ScheduledExecutorService;
 
 import static io.microsphere.collection.Lists.ofList;
+import static java.util.concurrent.TimeUnit.DAYS;
 import static java.util.concurrent.Executors.newSingleThreadScheduledExecutor;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static org.junit.jupiter.api.Assertions.assertEquals;
@@ -92,6 +93,10 @@ void test() throws Throwable {
             log("execute");
         });
 
+        instance.schedule(() -> {
+            log("delayed schedule");
+        }, 1, DAYS);
+
         // test shutdownNow
         assertFalse(instance.shutdownNow().isEmpty());