diff --git a/tests/version/test_markers.py b/tests/version/test_markers.py
index 98536e4e2c7..e87caf9a476 100644
--- a/tests/version/test_markers.py
+++ b/tests/version/test_markers.py
@@ -353,33 +353,33 @@ def test_marker_union_union_duplicates():
         'sys_platform == "darwin" or python_version <= "3.6" or os_name == "Windows"'
     )
 
+
 def test_marker_union_all_any():
-    union = MarkerUnion(
-        parse_marker(""),
-        parse_marker(""),
-    )
+    union = MarkerUnion(parse_marker(""), parse_marker(""),)
 
     assert union.is_any()
 
+
 def test_marker_union_all_any():
-    union = MarkerUnion(
-        parse_marker("<empty>"),
-        parse_marker("<empty>"),
-    )
+    union = MarkerUnion(parse_marker("<empty>"), parse_marker("<empty>"),)
 
     assert union.is_empty()
 
+
 def test_marker_str_conversion_skips_empty_and_any():
     union = MarkerUnion(
         parse_marker("<empty>"),
-        parse_marker('sys_platform == "darwin" or python_version <= "3.6" or os_name == "Windows"'),
-        parse_marker('')
+        parse_marker(
+            'sys_platform == "darwin" or python_version <= "3.6" or os_name == "Windows"'
+        ),
+        parse_marker(""),
     )
 
     assert str(union) == (
         'sys_platform == "darwin" or python_version <= "3.6" or os_name == "Windows"'
     )
 
+
 def test_intersect_compacts_constraints():
     m = parse_marker('python_version < "4.0"')