diff -urp flexmock.orig/test/partial_mock_test.rb flexmock/test/partial_mock_test.rb
--- flexmock.orig/test/partial_mock_test.rb	2024-11-18 15:38:57.625597258 +0900
+++ flexmock/test/partial_mock_test.rb	2024-11-18 15:44:56.469851634 +0900
@@ -633,7 +633,7 @@ class TestStubbing < Minitest::Test
     exception = assert_raises(NameError) do
         obj.mocked_method
     end
-    assert_match /undefined method `does_not_exist' for/, exception.message
+    assert_match /undefined method [`']does_not_exist' for/, exception.message
   end
 
   def test_it_checks_whether_mocks_are_forbidden_before_forwarding_the_call
Only in flexmock/test: partial_mock_test.rb~