gistfile1.txt

it 'should update rates when subject is accepted' do
  previous_rate = subject.sale_rate
  new_rate = rand(1..10).to_f
  subject.update_attribute(:sale_rate, new_rate)

  expect {
    subject.accept
  }.to change {
    subject.sale_rate.round(2).to_f
  }.by((new_rate - previous_rate).round(2).to_f)
end