Message Expectations Example

cron.rb

class Cron
  def self.run!
    User.send_digests!
  end
end

cron_spec.rb

require 'spec_helper'

describe Cron do
  context "delegating to models" do
    it "should delegate to User" do
      expect(User).to receive(:send_digests!)
      Cron.run!
    end
  end
end