BUG: Call finalize in DataFrame.unstack (#37369)

Author: mzeitlin11

doc/source/whatsnew/v1.2.0.rst

@@ -529,7 +529,7 @@ Other
 - Bug in :meth:`DataFrame.replace` and :meth:`Series.replace` incorrectly raising ``AssertionError`` instead of ``ValueError`` when invalid parameter combinations are passed (:issue:`36045`)
 - Bug in :meth:`DataFrame.replace` and :meth:`Series.replace` with numeric values and string ``to_replace`` (:issue:`34789`)
 - Fixed bug in metadata propagation incorrectly copying DataFrame columns as metadata when the column name overlaps with the metadata name (:issue:`37037`)
-- Fixed metadata propagation in the :class:`Series.dt` and :class:`Series.str` accessors and :class:`DataFrame.duplicated` and ::class:`DataFrame.stack` methods (:issue:`28283`)
+- Fixed metadata propagation in the :class:`Series.dt` and :class:`Series.str` accessors and :class:`DataFrame.duplicated` and :class:`DataFrame.stack` and :class:`DataFrame.unstack` and :class:`DataFrame.pivot` methods (:issue:`28283`)
 - Bug in :meth:`Index.union` behaving differently depending on whether operand is a :class:`Index` or other list-like (:issue:`36384`)
 - Passing an array with 2 or more dimensions to the :class:`Series` constructor now raises the more specific ``ValueError``, from a bare ``Exception`` previously (:issue:`35744`)
 

pandas/core/frame.py

@@ -7281,7 +7281,9 @@ def unstack(self, level=-1, fill_value=None):
         """
         from pandas.core.reshape.reshape import unstack
 
-        return unstack(self, level, fill_value)
+        result = unstack(self, level, fill_value)
+
+        return result.__finalize__(self, method="unstack")
 
     @Appender(_shared_docs["melt"] % dict(caller="df.melt(", other="melt"))
     def melt(

pandas/tests/generic/test_finalize.py

@@ -154,10 +154,7 @@
         ),
         marks=not_implemented_mark,
     ),
-    pytest.param(
-        (pd.DataFrame, frame_data, operator.methodcaller("pivot", columns="A")),
-        marks=not_implemented_mark,
-    ),
+    (pd.DataFrame, frame_data, operator.methodcaller("pivot", columns="A")),
     pytest.param(
         (
             pd.DataFrame,
@@ -171,10 +168,7 @@
         (pd.DataFrame, frame_data, operator.methodcaller("explode", "A")),
         marks=not_implemented_mark,
     ),
-    pytest.param(
-        (pd.DataFrame, frame_mi_data, operator.methodcaller("unstack")),
-        marks=not_implemented_mark,
-    ),
+    (pd.DataFrame, frame_mi_data, operator.methodcaller("unstack")),
     pytest.param(
         (
             pd.DataFrame,