1 files changed, 5 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/testing/method_call_assertions.rb b/activesupport/lib/active_support/testing/method_call_assertions.rb
index e3cbe40308..517f02e3ef 100644
--- a/activesupport/lib/active_support/testing/method_call_assertions.rb
+++ b/activesupport/lib/active_support/testing/method_call_assertions.rb
@@ -30,6 +30,10 @@ module ActiveSupport
         def assert_not_called(object, method_name, message = nil, &block)
           assert_called(object, method_name, message, times: 0, &block)
         end
+
+        def stub_any_instance(klass, instance: klass.new)
+          klass.stub(:new, instance) { yield instance }
+        end
     end
   end
-end
-\ No newline at end of file
+end