diff --git a/src/pipeline-tasks/pipeline-tasks.service.spec.ts b/src/pipeline-tasks/pipeline-tasks.service.spec.ts
index a47a082..ddce7df 100644
--- a/src/pipeline-tasks/pipeline-tasks.service.spec.ts
+++ b/src/pipeline-tasks/pipeline-tasks.service.spec.ts
@@ -155,20 +155,31 @@ describe('PipelineTasksService', () => {
     it('pipeline is busy', async () => {
       let remainTimes = 3;
 
-      const incr = jest
-        .spyOn(redisClient, 'incr')
-        .mockImplementation(() => remainTimes--);
+      let lckValue: string;
+      const set = jest
+        .spyOn(redisClient, 'set')
+        .mockImplementation(async (...args) => {
+          if (remainTimes-- > 0) {
+            throw new Error();
+          } else {
+            lckValue = args[3] as string;
+          }
+        });
+      const get = jest
+        .spyOn(redisClient, 'get')
+        .mockImplementation(async () => lckValue);
+      const del = jest.spyOn(redisClient, 'del');
       const rpop = jest.spyOn(redisClient, 'rpop');
-      const decr = jest.spyOn(redisClient, 'decr');
       const add = jest.spyOn(taskQueue, 'add');
 
       await service.doNextTask(getBasePipeline());
 
       expect(rpop).toHaveBeenCalledTimes(1);
-      expect(incr).toHaveBeenCalledTimes(3);
-      expect(decr).toHaveBeenCalledTimes(3);
+      expect(set).toHaveBeenCalledTimes(4);
+      expect(get).toHaveBeenCalledTimes(1);
+      expect(del).toHaveBeenCalledTimes(1);
       expect(add).toHaveBeenCalledWith(getTask());
-    });
+    }, 10_000);
     it('pipeline always busy and timeout', async () => {
       const set = jest
         .spyOn(redisClient, 'set')