[_606] limit caught error to iRODSException type for test/example

Author: d-w-moore

irods/test/meta_test.py

@@ -6,8 +6,9 @@
 import time
 import datetime
 import unittest
-from irods.meta import (iRODSMeta, AVUOperation, BadAVUOperationValue, BadAVUOperationKeyword)
+import irods.exception as ex
 from irods.manager.metadata_manager import InvalidAtomicAVURequest
+from irods.meta import (iRODSMeta, AVUOperation, BadAVUOperationValue, BadAVUOperationKeyword)
 from irods.models import (DataObject, Collection, Resource, CollectionMeta)
 import irods.test.helpers as helpers
 import irods.keywords as kw
@@ -127,7 +128,7 @@ def test_atomic_metadata_json_error__issue_606(self):
         obj.unlink(force = True)
         try:
             obj.metadata.apply_atomic_operations(AVUOperation(operation="add", avu=iRODSMeta('a','b','c')))
-        except Exception as e:
+        except ex.iRODSException as e:
             resp = e.server_msg.get_json_encoded_struct()
             self.assertIn(
                 'Entity does not exist [entity_name={}]'.format(obj.path),