diff --git a/Tests/test_file_dds.py b/Tests/test_file_dds.py
index 12be1056e..866220800 100644
--- a/Tests/test_file_dds.py
+++ b/Tests/test_file_dds.py
@@ -512,17 +512,19 @@ def test_save_dx10_bc5(tmp_path: Path) -> None:
     with pytest.raises(OSError, match="only RGB mode can be written as BC5"):
         im.save(out, pixel_format="BC5")
 
+
 @pytest.mark.parametrize(
     "pixel_format, mode",
     (
-        ('DXT1', 'RGBA'),
-        ('DXT3', 'RGBA'),
-        ('BC2', 'RGBA'),
-        ('BC3', 'RGBA'),
-        ('BC5', 'RGB'),
+        ("DXT1", "RGBA"),
+        ("DXT3", "RGBA"),
+        ("DXT5", "RGBA"),
+        ("BC2", "RGBA"),
+        ("BC3", "RGBA"),
+        ("BC5", "RGB"),
     ),
 )
 def test_save_large_file(tmp_path: Path, pixel_format: str, mode: str) -> None:
-    with hopper(mode).resize((440,440)) as im:
+    with hopper(mode).resize((440, 440)) as im:
         # should not error in valgrind
-        im.save(tmp_path / 'img.dds', 'DDS', pixel_format=pixel_format)
+        im.save(tmp_path / "img.dds", "DDS", pixel_format=pixel_format)