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Measuring Test Coverage with Rcov
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Rcov is a code coverage tool for Ruby written by Mauricio Fernandez (a.k.a. Eigenclass), which you can learn more about at http://eigenclass.org/hiki.rb rcov. It s easy to install as a RubyGem.
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$ sudo gem install rcov
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Once you ve installed the gem, running the coverage report is a simple matter of running rcov with the appropriate arguments.
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$ rcov --rails --text-summary test/*/*_test.rb
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Loaded suite /usr/local/bin/rcov Started .................. Finished in 0.40912 seconds. 18 tests, 78 assertions, 0 failures, 0 errors 72.7% 10 file(s) 178 Lines 143 LOC
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CHAPTER 9 TESTING YOUR APPLICATION
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Just as the text summary says, we have somewhere around 72.2% test coverage of our code base, which is quite respectable by any account. Rcov also generated an HTML report that shows us exactly which lines have been tested (and which ones haven t). Open coverage/index.html in your browser to see the full report, as shown in Figure 9-1.
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Figure 9-1. Coverage report from rcov
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QUICK CODE COVERAGE REPORTS
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Here s a task that you can add to your lib/tasks directory that will save you having to remember the arguments to rcov and make generating a coverage report a snap:
namespace :test do desc 'Measures test coverage' task :coverage do rm_f 'coverage' system 'rcov --rails --text-summary test/*/*_test.rb' end end
Save this snippet in lib/tasks/coverage.rake and run it using rake test:coverage.
CHAPTER 9 TESTING YOUR APPLICATION
Summary
This chapter introduced you to the Rails philosophy behind testing and stressed its importance as part of the development cycle. You ve now been on a complete tour of the baked-in facilities Rails provides for testing. You learned about testing your models with unit tests, testing your controllers with functional tests, and testing the whole Rails stack with integration tests. We even introduced some of the tools you can use to measure your test coverage. Testing is an important part of the development cycle, and despite the fact that we ve left it until near the end of this book, it s not something you should treat as an afterthought. Now that you know how to write a Rails application and how to test it, you can combine the steps: write some code, then test it. As you get into the code/test rhythm, (or better yet, test/code), you ll find that you ll be able to write better, more reliable software. And we think you ll sleep a little better at night, too.
CHAPTER
Extending Rails with Plugins
ails ships with a rich set of features and powerful functionality. It s often said that Rails is designed to solve most problems most of the time. It can t solve all problems or be all things to all people, and it doesn t try to do that. Instead, it provides a mechanism to easily extend and augment the core functionality: plugins. Plugins give developers the freedom to write extensions to Rails, without needing to include those additions in the Rails core code. In this chapter, we ll show you how plugins extend the functionality of Rails and make it even more comprehensive. We ll explain how to find and install plugins, and how to use plugins to add functionality to our events application. Finally, we ll create a plugin from scratch to showcase how you can extract common functionality from an application and share it with other projects and developers.
Finding and Installing Plugins
To help you manage your plugins, Rails ships with a plugin command in the script directory. To see its usage information, run the command without arguments:
$ ./script/plugin
Unknown command: Usage: plugin [OPTIONS] command Rails plugin manager. ...
As indicated by the output, you need to pass a command as a parameter to the plugin script. Table 10-1 shows the plugin command options.
CHAPTER 10 EXTENDING RAILS WITH PLUGINS
Table 10-1. Plugin Command Options Command
discover list install update remove source unsource
Description
Automatically add new plugin repositories. List all available plugins from the sources. Install a plugin from a known repository or a URL. Here s an example: plugin install continuous_builder. Update installed plugins. Uninstall a plugin. Install plugin from a known repository or a URL. For example: source http://dev.rubyonrails.com/svn/rails/plugins/. Remove a plugin repository. For example: unsource
http://dev.rubyonrails.com/svn/rails/plugins/.
The plugin system comes with a set of predefined Subversion repositories from which you can find and install plugins, so you don t need to learn the exact location of most of them. The list is kept internally by your Rails installation. As shown in Table 10-1, a few commands are available to help you manage this list of repositories.
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