diff --git a/libpysal/graph/tests/test_utils.py b/libpysal/graph/tests/test_utils.py
index b2fbaab20..db2ebdc9e 100644
--- a/libpysal/graph/tests/test_utils.py
+++ b/libpysal/graph/tests/test_utils.py
@@ -133,7 +133,8 @@ def test_validate_raises(
             numpy.arange(20).reshape(-1, 2), valid_geometry_types=contiguity_types
         )
 
+
 def fetch_map_string(m):
     out = m._parent.render()
     out_str = "".join(out.split())
-    return out_str
\ No newline at end of file
+    return out_str