more unit tests

tests/test_coding/test_concurrent.py

@@ -30,8 +30,8 @@ class TestConcurrent(unittest.TestCase):
             return x*2
 
         tpe = ThreadPoolExecutor(max_workers=2)
-
-        ret = parallel_construct([1, 2, 3], mult2, tpe)
+        with mock.start_active_span('Test span'):
+            ret = parallel_construct([1, 2, 3], mult2, tpe)
         self.assertEqual(ret, [2, 4, 6])
 
     def test_monitor_set(self):