Add test for Series.to_frame

pandas-dev · jorisvandenbossche · Nov 9, 2023 · Oct 30, 2023 · Oct 30, 2023 · Oct 31, 2023
commit 22c33c3370d601c2aa5b87da9f5cb7bfef131169
diff --git a/pandas/tests/frame/test_subclass.py b/pandas/tests/frame/test_subclass.py
@@ -799,6 +799,16 @@ def test_copy_series(self):
 
         tm.assert_series_equal(result, expected)
 
+    def test_series_to_frame(self):
+        orig = Series([1, 2, 3])
+        expected = orig.to_frame()
+        result = SimpleSeriesSubClass(orig).to_frame()
+
+        assert (
+            type(result) is DataFrame
+        )  # assert_frame_equal only checks isinstance(lhs, type(rhs))
+        tm.assert_frame_equal(result, expected)
+
     def test_groupby(self):
         df = SimpleDataFrameSubClass(DataFrame({"a": [1, 2, 3]}))