Rails - Jan 2010 - A problem when testing a CallBack in model

hey guys:
I met a very strange problem when testing a CallBack in model.

I think the codes are very straightforward.

model:

class Download < ActiveRecord::Base
  belongs_to :user
  belongs_to :drink
  after_create :add_download_count


  def add_download_count
  	drink = Drink.find(self.drink_id)
  	drink.download_count += 1
  	drink.save
  end
end


test:

require ''test_helper''

class DownloadTest < ActiveSupport::TestCase
  # Replace this with your real tests.

  def setup
    @drink = drinks(:one)
    @user = users(:quentin)
  end

  test "the download count should increase when some one download a
drink" do

    old_download_count = @drink.download_count
    puts @drink.download_count
    d = Download.new(:drink_id => @drink.id, :user_id => @user.id, :stars
=> 5)
    assert d.save
    assert_equal old_download_count + 1, @drink.reload.download_count

  end
end


But the test is always because the last assert.
the @drink''s download_count is not increase...


<6> expected but was
<5>.


This problem really make me crazy...
Hope you guys can give me some help

thanks a lot...

Terry

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