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It is a good idea to have proper unit tests in place, even if you re using an external plugin that has been tested thoroughly. The plugin API might change in later releases, and this would probably go unnoticed until one of your customers informs you about the problem. We ll create a basic test that verifies that you can create a post and also create a reply to it. Remember that the generate script has already created an empty unit test for us. All we need to do is add the code shown in Listing 6-2 to test/unit/forum_post_test.rb. Listing 6-2. Unit Test for the ForumPost Model require File.dirname(__FILE__) + '/../test_helper' class ForumPostTest < Test::Unit::TestCase fixtures :authors def test_create_post_and_reply post = ForumPost.new( :name => 'George', :subject => 'Subject', :body => 'Body text') assert post.save assert_not_nil ForumPost.find_by_name('George') reply = ForumPost.new(:name => 'Jill', :subject => 'Reply', :body => 'Reply body text', :parent_id => post.id) assert reply.save assert reply.child post.reload assert post.root assert_equal 1, post.all_children().size assert_equal reply, post.all_children()[0] end end

Google Base, currently still in public Beta status, is an application that lets users submit all types of data to Google. If the information is relevant to a particular search, Google will display the information in Google search results, Google maps, and other search specific areas. It s an open effort aimed at helping Google s search results be more accurate and drive more traffic to your web site. It is in your store s benefit to take advantage of this service. To take advantage of these services, you must visit http://www.google.com/base/ and sign up for an account. Then, enter in your login information by going to System Configuration Sales Google API Google Base. After you ve signed up for an account and entered your information, you can begin adding products to your Google base account by using the inventory of your Magento store (see Figure 4-27).

n Python, some names are spelled in a peculiar manner, with two leading and two trailing underscores. You have already encountered some of these (such as __future__, for example). This spelling signals that the name has a special significance you should never invent such names for your own programs. One set of such names that is very prominent in the language is the set of magic (or special) method names. If one of your objects implements one of these methods, that method will be called under specific circumstances (exactly which will depend on the name) by Python. There is rarely any need to call these methods directly. This chapter deals with a few important magic methods (most notably the __init__ method and some methods dealing with item access, allowing you to create sequences or mappings of your own). It also tackles two related topics: properties (previously dealt with through magic methods, now handled by the property function), and iterators (which use the magic method __iter__ to enable them to be used in for loops). You ll find a meaty example at the end of the chapter, which uses some of the things you have learned so far to solve a fairly difficult problem.