update for 2.3.x

Author: jorisvandenbossche

pandas/tests/frame/indexing/test_coercion.py

@@ -115,14 +115,24 @@ def test_26395(indexer_al):
         FutureWarning, match="Setting an item of incompatible dtype"
     ):
         indexer_al(df)["C", "D"] = 44.5
-    expected = DataFrame({"D": [0, 0, 44.5]}, index=["A", "B", "C"], dtype=np.float64)
+    expected = DataFrame(
+        {"D": [0, 0, 44.5]},
+        index=["A", "B", "C"],
+        columns=pd.Index(["D"], dtype=object),
+        dtype=np.float64,
+    )
     tm.assert_frame_equal(df, expected)
 
     with tm.assert_produces_warning(
         FutureWarning, match="Setting an item of incompatible dtype"
     ):
         indexer_al(df)["C", "D"] = "hello"
-    expected = DataFrame({"D": [0, 0, "hello"]}, index=["A", "B", "C"], dtype=object)
+    expected = DataFrame(
+        {"D": [0, 0, "hello"]},
+        index=["A", "B", "C"],
+        columns=pd.Index(["D"], dtype=object),
+        dtype=object,
+    )
     tm.assert_frame_equal(df, expected)