bpo-32299: Return patched dict when using patch.dict as a context manager (GH-11062)

Lib/unittest/test/testmock/testpatch.py

@@ -619,6 +619,13 @@ class PatchTest(unittest.TestCase):
         self.assertEqual(foo.values, original)
 
 
+    def test_patch_dict_as_context_manager(self):
+        foo = {'a': 'b'}
+        with patch.dict(foo, a='c') as patched:
+            self.assertEqual(patched, {'a': 'c'})
+        self.assertEqual(foo, {'a': 'b'})
+
+
     def test_name_preserved(self):
         foo = {}