Fix test

Author: jahn96

pandas/tests/reshape/concat/test_concat.py

@@ -945,9 +945,8 @@ def test_concat_with_moot_ignore_index_and_keys():
     df1 = DataFrame([[0]])
     df2 = DataFrame([[42]])
 
-    msg = (
-        "Setting ignore_index to true and providing key values are "
-        "counterproductive. Either should be used."
-    )
+    ignore_index = True
+    keys = ["df1", "df2"]
+    msg = f"Cannot set {ignore_index=} and specify keys. Either should be used."
     with pytest.raises(ValueError, match=msg):
-        concat([df1, df2], keys=["df1", "df2"], ignore_index=True)
+        concat([df1, df2], keys=keys, ignore_index=ignore_index)