TST: New error handling in tst_datatype

tests/test_datatype.py

@@ -204,4 +204,5 @@ def test_datatype_mismatch_in_response():
     with raises(db.TransactionError) as exc:
         # should not raise ValueError but transaction error.
         rt.insert()
-    assert exc.value.get_errors()[0].msg == "Cannot parse value to double."
+    assert exc.value.get_errors()[0].get_errors(
+    )[0].msg == "Cannot parse value to double."