I've been programming Ruby for just over a year now. When I started out, I was slightly puzzled over why Ruby had so many introspection hooks and runtime dynamics in it. When you would ever need to know programmatically when someone added a method?
My puzzlement has since turned fascination and my fascination turned complete awe. Matz is indeed a golden god for having the foresight to construct such an incredible rich environment for dynamic programming. As a frameworkextractor, I constantly find new ways to simplify the user experience by discovering the usefulness of yet another hook.
Just yesterday, I improved fixtures handling in Active Record test suites by extending the ever growing domain language of Rails to include the following style:
class PostTest < Test::Unit::TestCase
fixtures :posts, :comments
end
This macro-like construct ensures that the database fixtures are properly setup and torn down before each test case, but they also place the actual fixtures themselves in instance variables ready for immediate use:
def test_comments_to_post
@post_about_yesterday.comments << @fresh_comment
assert_equal @fresh_comment, @post_about_yesterday.comments.first
end
"post_about_yesterday" and "fresh_comment" are the file names of two fixtures. I didn't setup these instance variables explicitly. They simply spring to life when one uses the fixtures :posts, :comments construct.
Although this is terribly nice and Ruby made the implementation trivial (4 lines of code), it wasn't what I wanted to show you. See, the fixtures construct needs to do work in TestCase#setup, but how can I overwrite that without subclassing TestCase and without making the particular setup explicitly call an additional setup method for the fixtures to work?
In Ruby, easily. I take advantage of a object life-cycle callback named method_added that can be overwritten for notification. That is programmatically inform me when someone adds a new method.
With method_added, I stand guard for a user-added setup method, catch the definition, renamed their method to setup_without_fixtures, inject my own setup method that does the fixtures magic, and finally call setup_without_fixtures. All in measly six lines of code:
def self.method_added(method_symbol)
if method_symbol == :setup && !method_defined?(:setup_without_fixtures)
alias_method :setup_without_fixtures, :setup
define_method(:setup) do
instantiate_fixtures(*fixture_table_names)
setup_without_fixtures
end
end
end
This new fixture feature will be part of the upcoming Rails 0.8.5 release.
Thanks to Xal on #rubyonrails for suggesting the form for fixtures :posts and thanks to Nathaniel Talbott for pointing me in the direction of method_added.
A bit puzzled -- why not just have a regular ole instance method that can be called either in #setup or individual test methods? I don't see what the new "class instance method" construct offers that wouldn't be more directly understood inside standard Test::Unit methods.
def setup; do_something; fixtures :posts; do_something_else; end
Then it would be crystal clear what's going on. The magic looks very slick, but it does carry a cost.
First that most of the time you won't even need a dedicated setup method of your own because the fixtures have already been set up. So it's pretty annoying to have to make that method with nothing but a framework call.
Secondly, this approach enables you to have a setup method even if you need it. And you don't have to remember how to call the framework to setup the fixtures when you choose to overwrite it.
Third, this "fixtures :projects, :comments" style heralds the coming of a new style for declaring dependencies. The test depends on fixtures. Just like the controllers will soon depend on models and helpers and services.
Oh sure, pull out the DI trump card. :-) I guess this would just push toward smaller test classes if I had different combinations of fixtures I wanted to use.
Can't wait for DI to arrive; what I grok of Jamis' paper looks like it will make Rails luxurious to hack. I had been wondering how to go about extending AR cleanly...
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