add test for permissive defaults

Author: Joseph Damiba

packages/python/plotly/plotly/tests/test_core/test_px/test_px.py

@@ -1,5 +1,7 @@
 import plotly.express as px
 import numpy as np
+import pytest
+
 
 
 def test_scatter():
@@ -232,3 +234,9 @@ def assert_orderings(days_order, days_check, times_order, times_check):
     for days in permutations(df["day"].unique()):
         for times in permutations(df["time"].unique()):
             assert_orderings(days, days, times, times)
+
+def check_permissive_defaults():
+    msg = "AttributeError: 'PxDefaults' object has no attribute 'should_not_work'"
+    with pytest.raises(AttributeError, match=msg):
+        px.defaults.should_not_work = "test"
+