Mar 10, 2026 · Mar 10, 2026 · Mar 10, 2026 · Mar 10, 2026 · Mar 10, 2026
diff --git a/Lib/test/test_unittest/testmock/testmock.py b/Lib/test/test_unittest/testmock/testmock.py
 mock_method.assert_called_once_with()
 self.assertRaises(TypeError,mock_method,'extra_arg')

 #Issue145754
 deftest_create_autospec_type_hints_typechecking(self):
 fromtypingimportTYPE_CHECKING
 ifTYPE_CHECKING:
 fromtypingimportTuple

 deffoo(x:Tuple[int, ...])->None:
 pass

 mock.create_autospec(foo)

 #Issue21238
 deftest_mock_unsafe(self):
 m=Mock()
diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
 import pkgutil
 from inspect import iscoroutinefunction
 import threading
 from annotationlib import Format
 from dataclasses import fields, is_dataclass
 from types import CodeType, ModuleType, MethodType
 from unittest.util import safe_repr
    else:
        sig_func = func
    try:
        return func, inspect.signature(sig_func)
        return func, inspect.signature(sig_func, annotation_format=Format.FORWARDREF)
    except ValueError:
        # Certain callable types are not supported by inspect.signature()
        return None
diff --git a/Misc/NEWS.d/next/Library/2026-03-10-14-57-15.gh-issue-145754.YBL5Ko.rst b/Misc/NEWS.d/next/Library/2026-03-10-14-57-15.gh-issue-145754.YBL5Ko.rst
 Request signature during mock autospec with ``FORWARDREF`` annotation format.
 This prevents runtime errors when a type referred in a type hint is
 imported within a ``TYPE_CHECKING`` block.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -1743,6 +1743,17 @@ def static_method(): pass
		mock_method.assert_called_once_with()
		self.assertRaises(TypeError,mock_method,'extra_arg')

		#Issue145754
		deftest_create_autospec_type_hints_typechecking(self):
		fromtypingimportTYPE_CHECKING
		ifTYPE_CHECKING:
		fromtypingimportTuple

		deffoo(x:Tuple[int, ...])->None:
		pass

		mock.create_autospec(foo)

		#Issue21238
		deftest_mock_unsafe(self):
		m=Mock()
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -34,6 +34,7 @@
		import pkgutil
		from inspect import iscoroutinefunction
		import threading
		from annotationlib import Format
		from dataclasses import fields, is_dataclass
		from types import CodeType, ModuleType, MethodType
		from unittest.util import safe_repr
Expand DownExpand Up		@@ -119,7 +120,7 @@ def _get_signature_object(func, as_instance, eat_self):
		else:
		sig_func = func
		try:
		return func, inspect.signature(sig_func)
		return func, inspect.signature(sig_func, annotation_format=Format.FORWARDREF)
		except ValueError:
		# Certain callable types are not supported by inspect.signature()
		return None
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		Request signature during mock autospec with ``FORWARDREF`` annotation format.
		This prevents runtime errors when a type referred in a type hint is
		imported within a ``TYPE_CHECKING`` block.