diff --git a/tests/test_vtp.py b/tests/test_vtp.py
index 5b2dc295c..4b6f14a22 100644
--- a/tests/test_vtp.py
+++ b/tests/test_vtp.py
@@ -73,10 +73,11 @@ def test_read_from_file(filename, ref_cells, ref_num_cells, ref_num_pnt):
     [
         ("03_cow_strips.vtp", "triangle", 5804, 2903),
         ("04_raw_binary_strips.vtp", "triangle", 108, 56),
-
     ],
 )
-def test_read_from_file_triangle_strips(filename, ref_cells, ref_num_cells, ref_num_pnt):
+def test_read_from_file_triangle_strips(
+    filename, ref_cells, ref_num_cells, ref_num_pnt
+):
     this_dir = pathlib.Path(__file__).resolve().parent
     filename = this_dir / "meshes" / "vtp" / filename
 
@@ -90,13 +91,17 @@ def test_read_from_file_triangle_strips(filename, ref_cells, ref_num_cells, ref_
 @pytest.mark.parametrize(
     "filename, ref_cell_dict, ref_num_pnt, ref_cell_blocks",
     [
-        ("05_cow_strips_mixed.vtp", {"triangle" : 734,
-                                     "quad" : 2519,
-                                     "polygon" : 10}, 2903, 22),
-
+        (
+            "05_cow_strips_mixed.vtp",
+            {"triangle": 734, "quad": 2519, "polygon": 10},
+            2903,
+            22,
+        ),
     ],
 )
-def test_read_from_file_polydata_mixed(filename, ref_cell_dict, ref_num_pnt, ref_cell_blocks):
+def test_read_from_file_polydata_mixed(
+    filename, ref_cell_dict, ref_num_pnt, ref_cell_blocks
+):
     this_dir = pathlib.Path(__file__).resolve().parent
     filename = this_dir / "meshes" / "vtp" / filename