TST: Add regression tests for enlarging MultiIndex with None keys (GH#59153)

Author: wdyy20041223

pandas/tests/indexing/multiindex/test_setitem.py

@@ -510,8 +510,8 @@ def test_setitem_enlargement_multiindex_with_none(self):
             index=expected_index,
             columns=[0, 1],
         )
-
-        tm.assert_frame_equal(df, expected, check_exact=False)
+        # check_index_type=False because None in MultiIndex causes mixed inferred_type
+        tm.assert_frame_equal(df, expected, check_index_type=False)
 
         # Test retrieval of the newly added row
         result = df.loc[("A", None), :]
@@ -543,8 +543,8 @@ def test_setitem_enlargement_multiindex_multiple_none(self):
             index=expected_index,
             columns=["x", "y"],
         )
-
-        tm.assert_frame_equal(df, expected, check_exact=False)
+        # check_index_type=False because None in MultiIndex causes mixed inferred_type
+        tm.assert_frame_equal(df, expected, check_index_type=False)