spec.rb

describe 'conversations/base' do

  subject do
    Timecop.freeze(10.minutes.ago) do
      FactoryGirl.create(:conversation)
    end
  end

  before :each do
    assign(:object, subject)
  end

  it 'expire the conversation when the conversation is updated' do
    expect {
      subject.update_attribute(:name, 'test')
      subject.reload
    }.to change(self, :render)
  end

end