improve test

Author: attack68

pandas/tests/io/formats/test_style.py

@@ -1726,8 +1726,9 @@ def test_tooltip_render(self):
     def test_tooltip_ignored(self):
         # GH 21266
         df = pd.DataFrame(data=[[0, 1], [2, 3]])
-        s = Styler(df, uuid="_")  # no set_tooltips()
-        assert '<style  type="text/css" >\n</style>' in s.render()
+        s = Styler(df, uuid="_").set_tooltip_class("pd-t").render()  # no set_tooltips()
+        assert '<style  type="text/css" >\n</style>' in s
+        assert '<span class="pd-t"></span>' not in s
 
 
 @td.skip_if_no_mpl