diff --git a/mp_api/client/mprester.py b/mp_api/client/mprester.py
index f19f4a3e..c357e266 100644
--- a/mp_api/client/mprester.py
+++ b/mp_api/client/mprester.py
@@ -942,7 +942,9 @@ def get_ion_reference_data(self) -> list[dict]:
             query={"project": "ion_ref_data"},
             fields=["identifier", "formula", "data"],
             paginate=True,
-        ).get("data")  # type: ignore
+        ).get(
+            "data"
+        )  # type: ignore
 
     def get_ion_reference_data_for_chemsys(self, chemsys: str | list) -> list[dict]:
         """Download aqueous ion reference data used in the construction of Pourbaix diagrams.
@@ -1221,10 +1223,8 @@ def get_bandstructure_by_material_id(
         Returns:
             bandstructure (Union[BandStructure, BandStructureSymmLine]): BandStructure or BandStructureSymmLine object
         """
-        return (
-            self.electronic_structure_bandstructure.get_bandstructure_from_material_id(  # type: ignore
-                material_id=material_id, path_type=path_type, line_mode=line_mode
-            )
+        return self.electronic_structure_bandstructure.get_bandstructure_from_material_id(  # type: ignore
+            material_id=material_id, path_type=path_type, line_mode=line_mode
         )
 
     def get_dos_by_material_id(self, material_id: str):
diff --git a/tests/materials/core_function.py b/tests/materials/core_function.py
index 2d3c7ecd..bb7138c6 100644
--- a/tests/materials/core_function.py
+++ b/tests/materials/core_function.py
@@ -62,8 +62,10 @@ def client_search_testing(
                     }
 
                 if q is None:
-                    raise ValueError(f"Parameter '{param}' with type '{param_type}' was not "
-                                     "properly identified in the generic search method test.")
+                    raise ValueError(
+                        f"Parameter '{param}' with type '{param_type}' was not "
+                        "properly identified in the generic search method test."
+                    )
 
                 doc = search_method(**q)[0].model_dump()