fix(core): update

test/test.cronmanager.ts

@@ -6,6 +6,22 @@ let testCronManager: smarttime.CronManager;
 
 tap.test('should create a valid instance of cronmanager', async () => {
   testCronManager = new smarttime.CronManager();
+  expect(testCronManager).to.be.instanceOf(smarttime.CronManager);
+});
+
+tap.test('should create a valid cronJon', async (tools) => {
+  const done = tools.defer();
+  let counter = 0;
+  testCronManager.addCronjob('* * * * * *', () => {
+    if(counter === 10) {
+      done.resolve();
+    }
+    counter ++;
+    console.log(`hey ${counter}`);
+  });
+  testCronManager.start();
+  await done.promise;
+  testCronManager.stop();
 });
 
 tap.start();