diff --git a/tobac/tests/test_iris_xarray_match_utils.py b/tobac/tests/test_iris_xarray_match_utils.py
index 1baf6182..b56b3f54 100644
--- a/tobac/tests/test_iris_xarray_match_utils.py
+++ b/tobac/tests/test_iris_xarray_match_utils.py
@@ -1,6 +1,7 @@
 """Tests to confirm that xarray and iris pathways work the same and produce the same data
  for the same input datasets.
 """
+
 import copy
 import datetime