class RuboCop::Cop::RSpec::Dialect

def on_send(node)
  return unless rspec_method?(node)
  return unless preferred_methods[node.method_name]
  msg = format(MSG, prefer: preferred_method(node.method_name),
                    current: node.method_name)
  add_offense(node, message: msg) do |corrector|
    current = node.loc.selector
    preferred = preferred_method(current.source)
    corrector.replace(current, preferred)
  end
end