diff --git a/entry/src/ohosTest/ets/test/DefaultJobQueueTest.test.ets b/entry/src/ohosTest/ets/test/DefaultJobQueueTest.test.ets
index e1c1401..4c5e5a1 100644
--- a/entry/src/ohosTest/ets/test/DefaultJobQueueTest.test.ets
+++ b/entry/src/ohosTest/ets/test/DefaultJobQueueTest.test.ets
@@ -52,6 +52,13 @@ export default function DefaultJobQueueTest() {
         expect(imageKnife.maxRequests).assertEqual(10);
       };
     })
+    it("downsampleOf", 1, () => {
+      let request: RequestOption = new RequestOption()
+      if (request) {
+        let requests =  request.downsampleOf(new fitter())
+        expect(requests.downsampType.getName()=='FitCenter').assertTrue()
+      };
+    })
   });
 }
 
@@ -62,3 +69,5 @@ function makeRequest(src: string, context: common.UIAbilityContext, priority: ta
   request.moduleContext = context;
   return request;
 }
+
+