class RSpec::Mocks::AnyInstance::Recorder

def stub(method_name_or_method_map, &block)
  if Hash === method_name_or_method_map
    method_name_or_method_map.each do |method_name, return_value|
      stub(method_name).and_return(return_value)
    end
  else
    observe!(method_name_or_method_map)
    message_chains.add(method_name_or_method_map, StubChain.new(self, method_name_or_method_map, &block))
  end
end