1 files changed, 55 insertions, 0 deletions
diff --git a/spec/support/patches/rspec_mocks_prepended_methods.rb b/spec/support/patches/rspec_mocks_prepended_methods.rb
new file mode 100644
index 00000000000..fa3a74c670c
--- /dev/null
+++ b/spec/support/patches/rspec_mocks_prepended_methods.rb
@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+# This patch allows stubbing of prepended methods
+# Based on https://github.com/rspec/rspec-mocks/pull/1218
+
+module RSpec
+  module Mocks
+    module InstanceMethodStasherForPrependedMethods
+      private
+
+      def method_owned_by_klass?
+        owner = @klass.instance_method(@method).owner
+        owner = owner.class unless Module === owner
+
+        owner == @klass ||
+          # When `extend self` is used, and not under any instance of
+          (owner.singleton_class == @klass && !Mocks.space.any_instance_recorder_for(owner, true)) ||
+          !method_defined_on_klass?(owner)
+      end
+    end
+  end
+end
+
+module RSpec
+  module Mocks
+    module MethodDoubleForPrependedMethods
+      def restore_original_method
+        return show_frozen_warning if object_singleton_class.frozen?
+        return unless @method_is_proxied
+
+        remove_method_from_definition_target
+
+        if @method_stasher.method_is_stashed?
+          @method_stasher.restore
+          restore_original_visibility
+        end
+
+        @method_is_proxied = false
+      end
+
+      def restore_original_visibility
+        method_owner.__send__(@original_visibility, @method_name)
+      end
+
+      private
+
+      def method_owner
+        @method_owner ||= Object.instance_method(:method).bind(object).call(@method_name).owner
+      end
+    end
+  end
+end
+
+RSpec::Mocks::InstanceMethodStasher.prepend(RSpec::Mocks::InstanceMethodStasherForPrependedMethods)
+RSpec::Mocks::MethodDouble.prepend(RSpec::Mocks::MethodDoubleForPrependedMethods)