diff --git a/doc/whats-new.rst b/doc/whats-new.rst
index 264c07f562b..6a4c953ffd3 100644
--- a/doc/whats-new.rst
+++ b/doc/whats-new.rst
@@ -32,6 +32,8 @@ New Features
   `Tom Nicholas <https://github.com/TomNicholas>`_.
 - Added zarr backends for :py:func:`open_groups` (:issue:`9430`, :pull:`9469`).
   By `Eni Awowale <https://github.com/eni-awowale>`_.
+- Implement handling of complex numbers (netcdf4/h5netcdf) and enums (h5netcdf) (:issue:`9246`, :issue:`3297`, :pull:`9509`).
+  By `Kai Mühlbauer <https://github.com/kmuehlbauer>`_.
 
 Breaking changes
 ~~~~~~~~~~~~~~~~
diff --git a/xarray/tests/test_backends.py b/xarray/tests/test_backends.py
index bb7406fd501..dcd9a9bc5c4 100644
--- a/xarray/tests/test_backends.py
+++ b/xarray/tests/test_backends.py
@@ -1858,7 +1858,7 @@ def test_encoding_enum__no_fill_value(self):
                     fill_value=None,
                 )
                 v[:] = 1
-            with open_dataset(tmp_file, engine=self.engine) as original:
+            with open_dataset(tmp_file) as original:
                 save_kwargs = {}
                 # We don't expect any errors.
                 # This is effectively a void context manager