From 3e2a2df506f955007c9ca6f1650663c9e035cd1c Mon Sep 17 00:00:00 2001
From: Christian Klein <167265+cklein@users.noreply.github.com>
Date: Wed, 4 Jan 2023 21:45:26 +0100
Subject: [PATCH 1/2] Respect mock spec when checking for unsafe prefixes

---
 Lib/test/test_unittest/testmock/testmock.py      | 16 ++++++++++++++++
 Lib/unittest/mock.py                             |  2 +-
 ...023-01-04-09-53-38.gh-issue-100740.-j5UjI.rst |  1 +
 3 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2023-01-04-09-53-38.gh-issue-100740.-j5UjI.rst

diff --git a/Lib/test/test_unittest/testmock/testmock.py b/Lib/test/test_unittest/testmock/testmock.py
index 8a92490137f9a7..b224f87fa3e4a1 100644
--- a/Lib/test/test_unittest/testmock/testmock.py
+++ b/Lib/test/test_unittest/testmock/testmock.py
@@ -1652,6 +1652,22 @@ def test_mock_unsafe(self):
         m.aseert_foo_call()
         m.assrt_foo_call()
 
+    # gh-100739
+    def test_mock_safe_with_spec(self):
+        class Foo(object):
+            def assert_bar(self):
+                pass
+
+            def assertSome(self):
+                pass
+
+        m = Mock(spec=Foo)
+        m.assert_bar()
+        m.assertSome()
+
+        m.assert_bar.assert_called_once()
+        m.assertSome.assert_called_once()
+
     #Issue21262
     def test_assert_not_called(self):
         m = Mock()
diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index 994947cad518f9..47928e56485035 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -652,7 +652,7 @@ def __getattr__(self, name):
                 raise AttributeError("Mock object has no attribute %r" % name)
         elif _is_magic(name):
             raise AttributeError(name)
-        if not self._mock_unsafe:
+        if not self._mock_unsafe and (not self._mock_methods or name not in self._mock_methods):
             if name.startswith(('assert', 'assret', 'asert', 'aseert', 'assrt')):
                 raise AttributeError(
                     f"{name!r} is not a valid assertion. Use a spec "
diff --git a/Misc/NEWS.d/next/Library/2023-01-04-09-53-38.gh-issue-100740.-j5UjI.rst b/Misc/NEWS.d/next/Library/2023-01-04-09-53-38.gh-issue-100740.-j5UjI.rst
new file mode 100644
index 00000000000000..d3a0c3dff2ddcc
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-01-04-09-53-38.gh-issue-100740.-j5UjI.rst
@@ -0,0 +1 @@
+Fix Mock not respecting the spec for attribute names prefixed with assert

From f43a0f6afefccebb4f2001e1c415bf22cd971b56 Mon Sep 17 00:00:00 2001
From: Christian Klein <167265+cklein@users.noreply.github.com>
Date: Wed, 4 Jan 2023 21:45:32 +0100
Subject: [PATCH 2/2] Update
 Misc/NEWS.d/next/Library/2023-01-04-09-53-38.gh-issue-100740.-j5UjI.rst

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
---
 .../next/Library/2023-01-04-09-53-38.gh-issue-100740.-j5UjI.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Misc/NEWS.d/next/Library/2023-01-04-09-53-38.gh-issue-100740.-j5UjI.rst b/Misc/NEWS.d/next/Library/2023-01-04-09-53-38.gh-issue-100740.-j5UjI.rst
index d3a0c3dff2ddcc..4753e7b408250c 100644
--- a/Misc/NEWS.d/next/Library/2023-01-04-09-53-38.gh-issue-100740.-j5UjI.rst
+++ b/Misc/NEWS.d/next/Library/2023-01-04-09-53-38.gh-issue-100740.-j5UjI.rst
@@ -1 +1 @@
-Fix Mock not respecting the spec for attribute names prefixed with assert
+Fix ``unittest.mock.Mock`` not respecting the spec for attribute names prefixed with ``assert``.