module Marshal

def dump_with_mocks(object, *rest)

serialization will fail because methods exist on the singleton class.
Duplicates any mock objects before serialization. Otherwise, 
def dump_with_mocks(object, *rest)
  if ::RSpec::Mocks.space.nil? || !::RSpec::Mocks.space.registered?(object) || NilClass === object
    dump_without_mocks(object, *rest)
  else
    dump_without_mocks(object.dup, *rest)
  end
end