spy and verify

gistfile1.txt

require 'spec_helper'
 
describe MyController do
  describe "create" do
    it "filters sensitive data from the log" do
      invocations = Rails.logger.spy_on.add

      post :create, :myobj => {:social_security_number => "123-45-6789"}
 
      invocations.grep(/Parameters:/).first.should include('"social_security_number"=>"[FILTERED]"')
    end
  end
end