Address review: use DataFrame constructor directly

Author: zhan7236

pandas/tests/frame/indexing/test_where.py

@@ -1068,7 +1068,7 @@ def test_where_inplace_no_other():
 def test_where_other_nullable_dtype():
     # GH#49052 DataFrame.where should return nullable dtype when
     # other is a Series with nullable dtype, matching Series.where behavior
-    df = Series([1, 2, 3], dtype="int64").to_frame()
+    df = DataFrame([1, 2, 3], dtype="int64")
     other = Series([pd.NA, pd.NA, pd.NA], dtype="Int64")
     result = df.where(df > 1, other, axis=0)
     expected = DataFrame({0: Series([pd.NA, 2, 3], dtype="Int64")})