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

Author: wdyy20041223

pandas/tests/indexing/multiindex/test_setitem.py

@@ -506,15 +506,15 @@ def test_setitem_enlargement_multiindex_with_none(self):
             [("A", "a1"), ("A", "a2"), ("B", "b1"), ("B", None), ("A", None)]
         )
         expected = DataFrame(
-            [[0, 6], [1, 5], [2, 4], [3, 7], [12, 13]],
+            [[0.0, 6.0], [1.0, 5.0], [2.0, 4.0], [3.0, 7.0], [12.0, 13.0]],
             index=expected_index,
             columns=[0, 1],
         )
         tm.assert_frame_equal(df, expected)
 
         # Test retrieval of the newly added row
         result = df.loc[("A", None), :]
-        expected_row = Series([12, 13], index=[0, 1], name=("A", np.nan))
+        expected_row = Series([12.0, 13.0], index=[0, 1], name=("A", np.nan))
         tm.assert_series_equal(result, expected_row)
 
     def test_setitem_enlargement_multiindex_multiple_none(self):
@@ -538,7 +538,7 @@ def test_setitem_enlargement_multiindex_multiple_none(self):
             ]
         )
         expected = DataFrame(
-            [[1, 2], [3, 4], [5, 6], [7, 8]],
+            [[1.0, 2.0], [3.0, 4.0], [5.0, 6.0], [7.0, 8.0]],
             index=expected_index,
             columns=["x", "y"],
         )