diff --git a/graphene/utils/tests/test_str_converters.py b/graphene/utils/tests/test_str_converters.py
index b11cda91..d765906c 100644
--- a/graphene/utils/tests/test_str_converters.py
+++ b/graphene/utils/tests/test_str_converters.py
@@ -24,4 +24,4 @@ def test_to_const():
 
 
 def test_to_const_unicode():
-    assert to_const('Skoða þetta unicode stöff') == 'SKODA_THETTA_UNICODE_STOFF'
+    assert to_const("Skoða þetta unicode stöff") == "SKODA_THETTA_UNICODE_STOFF"