Update pow check approach in test_object using proofofwork.Worker

minode/tests/test_structure.py

@@ -122,8 +122,7 @@ class TestStructure(unittest.TestCase):
         obj = structure.Object(
             b'\x00' * 8, int(time.time() + 300), 42, 1, 2, b'HELLO')
         vector = obj.vector
-        proofofwork._worker(obj)  # pylint: disable=protected-access
-        obj = shared.objects.popitem()[1]
+        obj = proofofwork.Worker().add_pow(obj)
         self.assertNotEqual(obj.vector, vector)
         self.assertFalse(obj.is_expired())
         self.assertFalse(obj.is_valid())