issue gh-153888: autospec doesn't work with lazy-imported symbols

Lib/test/test_unittest/testmock/testpatch.py

@@ -23,6 +23,7 @@
 builtin_string = 'builtins'
 
 PTModule = sys.modules[__name__]
+lazy from json import dumps as lazy_dumps # noqa: F401
 MODNAME = '%s.PTModule' % __name__
 
 
@@ -2101,5 +2102,12 @@ def test(_):
         test()
 
 
+    def test_patch_autospec_lazy_import(self):
+        self.assertIn("lazy_dumps", globals())
+
+        with patch(f"{__name__}.lazy_dumps", autospec=True) as mock_dumps:
+            mock_dumps({})
+            mock_dumps.assert_called_once_with({})
+
 if __name__ == '__main__':
     unittest.main()

Lib/unittest/mock.py

@@ -31,6 +31,7 @@
 import sys
 import builtins
 import pkgutil
+import types
 from inspect import iscoroutinefunction
 import threading
 from annotationlib import Format
@@ -1469,7 +1470,9 @@ def get_original(self):
         except (AttributeError, KeyError):
             original = getattr(target, name, DEFAULT)
         else:
-            local = True
+             local = True
+             if isinstance(original, types.LazyImportType):
+              original = original.resolve()
 
         if name in _builtins and isinstance(target, ModuleType):
             self.create = True

Misc/NEWS.d/next/Library/2026-07-18-14-20-13.gh-issue-153888.K9Otcl.rst

@@ -0,0 +1,2 @@
+Fix :func:`unittest.mock.patch` with ``autospec``, ``spec``, or ``spec_set``
+when used with lazy-imported objects.