TST: Assert Index values remain same after set operations

Author: deniskrds

pandas/tests/indexes/timedeltas/test_setops.py

@@ -125,6 +125,7 @@ def test_intersection_equal(self, sort):
         # Corner cases
         inter = first.intersection(first, sort=sort)
         assert inter is not first
+        tm.assert_index_equal(inter, first)  
 
     @pytest.mark.parametrize("period_1, period_2", [(0, 4), (4, 0)])
     def test_intersection_zero_length(self, period_1, period_2, sort):