Rspec: How to test retry?

I have implemented Optimistic Locking for Race Condition. If lock_version doesn't match with the updated lock_version in the database, then it will trigger retry three times. Can you suggest how to test this retry event

#Product: Model's new field:
    #  lock_version                       :integer(4)      default(0), not null

def recalculate
  method_1
  self.save!
end

private
def method_1
    begin
      ####
      ####
      if self.lock_version == Product.find(self.id).lock_version
         Product.where(:id => self.id).update_all(attributes)
      else
         raise ActiveRecord::StaleObjectError.new(self, "test")
      end
    rescue ActiveRecord::StaleObjectError => e
        if tries < 3
           tries += 1
           sleep(1 + tries)
           self.reload
           retry
        else
           raise Exception.new(timeout.inspect)
        end
    end
end

Rspec Unit Test:

  it 'if car is updated then ActiveRecord::StaleObjectError should be raised' do
    prod_v1 =Product.find(@prod.id)
    prod_v2 = Car.find(@prod.id)
    prod_v1.recalculate
    prod_v1.reload  # will make lock_version of prod_v1 to 1
    prod_v2.recalculate # howvever lock_version of prod_v2 is still 0.
    expect{car_v2.send(:method1)}.to receive(:retry)
  end