bpo-39481: Make functools.cached_property, partial, partialmethod generic (#19427)

diff --git a/Lib/test/test_genericalias.py b/Lib/test/test_genericalias.py
index 02b7283..770aeef 100644
--- a/Lib/test/test_genericalias.py
+++ b/Lib/test/test_genericalias.py
@@ -9,6 +9,7 @@
 from concurrent.futures import Future
 from concurrent.futures.thread import _WorkItem
 from contextlib import AbstractContextManager, AbstractAsyncContextManager
+from functools import partial, partialmethod, _lru_cache_wrapper, cached_property
 from ctypes import Array, LibraryLoader
 from difflib import SequenceMatcher
 from filecmp import dircmp
@@ -49,6 +50,7 @@
                   FileInput,
                   OrderedDict, Counter, UserDict, UserList,
                   Pattern, Match,
+                  partial, partialmethod, cached_property,
                   AbstractContextManager, AbstractAsyncContextManager,
                   Awaitable, Coroutine,
                   AsyncIterable, AsyncIterator,