fix linting + catch remaining RuntimeWarning

Author: jorisvandenbossche

pandas/tests/indexes/multi/test_set_ops.py

@@ -287,9 +287,10 @@ def test_intersection(idx, sort):
 
 def test_intersect_equal_sort():
     idx = pd.MultiIndex.from_product([[1, 0], ['a', 'b']])
-    sorted_ = pd.MultiIndex.from_product([[0, 1], ['a', 'b']])
+    # sorted_ = pd.MultiIndex.from_product([[0, 1], ['a', 'b']])
     tm.assert_index_equal(idx.intersection(idx, sort=False), idx)
     tm.assert_index_equal(idx.intersection(idx, sort=None), idx)
+    # TODO decide on True behaviour
     # tm.assert_index_equal(idx.intersection(idx, sort=True), sorted_)
 
 

pandas/tests/indexes/test_base.py

@@ -830,14 +830,15 @@ def test_union_sort_other_special(self, slice_):
     def test_union_sort_other_incomparable(self):
         # https://github.com/pandas-dev/pandas/issues/24959
         idx = pd.Index([1, pd.Timestamp('2000')])
-        # default, sort=None
+        # default (sort=None)
         with tm.assert_produces_warning(RuntimeWarning):
             result = idx.union(idx[:1])
 
         tm.assert_index_equal(result, idx)
 
-        # sort=False
-        result = idx.union(idx[:1], sort=None)
+        # sort=None
+        with tm.assert_produces_warning(RuntimeWarning):
+            result = idx.union(idx[:1], sort=None)
         tm.assert_index_equal(result, idx)
 
         # TODO decide on True behaviour