[test][worker] Fix test string/bytes data creation for comparison

beat/core/test/test_worker.py

@@ -366,7 +366,7 @@ class TestConnection(TestWorkerBase):
         self.start_worker(WORKER1, 'tcp://127.0.0.1:50999')
 
         message = controller.queue.get()
-        self.assertEqual(message, 'READY ' + WORKER1)
+        self.assertEqual(message, 'READY %s' % WORKER1)
 
         controller.queue.put('STOP')
 
@@ -379,7 +379,7 @@ class TestConnection(TestWorkerBase):
         self.assertEqual(message, 'STARTED')
 
         message = controller.queue.get()
-        self.assertEqual(message, 'READY ' + WORKER1)
+        self.assertEqual(message, 'READY %s' % WORKER1)
 
         controller.queue.put('STOP')
 
@@ -530,7 +530,7 @@ class TestOneWorker(TestWorkerBase):
         self.assertEqual(worker, WORKER1)
         self.assertEqual(status, WorkerController.ERROR)
         self.assertTrue(job_id is None)
-        self.assertEqual(data[0], "Unknown job: 1")
+        self.assertEqual(data[0], b"Unknown job: 1")
 
 
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