Shoulda is a framework that sits on top of Test::Unit and adds a ton of nice features like macro's, nested context, and the ability to create custom tests in a block-based DSL.

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RSpec provides an extremely concise way of representing simple tests to be called on new instances of a class or on explicitly defined receiver objects. You can do this by using 'subjects' either as defined by the 'describe' or the 'subject' methods.

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Maintainability of your code can be measured in many different ways. Jake Scruggs has combined several of the tools that measure you code into one Ruby Gem: metric_fu.

Here's a demonstration. Go check it out!

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Ruby uses special characters to define certain data types. If you wish to use these characters in your data types, you need to escape them or use percent functions.

Percent functions are much simpler.

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Ruby on Rails allows you to nest models within a form. Ryan Bates of Railscasts demonstrated how to set up these forms with JavaScript using the Prototype framework, which ships with Rails. In this episode, Charles Max Wood gives a brief overview of how Ryan's code works, and then refactors the JavaScript to use JQuery.

Ryan Bates demonstrated how to build a form with nested attributes in Ruby on Rails with Prototype. This screencast demonstrates how to refactor that form into usage of jQuery.

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RVM is a program that allows you to install and manage multiple versions of Ruby and Gems. This setup is ideal for testing your application or gem (library) against multiple versions of Ruby.Also, if you're looking into Rails 3 on Ruby 1.9 this is a great way to try it out.

Are you thinking about moving your application to Ruby 1.9? Do you have a gem or plugin you need to test in multiple Ruby versions?

RVM is your tool. It allows you to manage and install multiple Ruby versions and the gems installed under each version.

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Loading multiple Ruby Gems can result in runtime errors when an incompatible version of a gem dependency is already loaded as a dependency of another gem.Gem bundler can also pre-load and cache gems for faster loading.

Having two gems that require different versions of the same dependency can sometimes cause runtime errors. Yehuda Katz and Carl Lerche have created an elegant solution in the Gem Bundler.

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In this screencast, I cover how to use custom Grails configurations along with filters to enable url-based site skins.

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Are you new to Ruby and want to get a head start? In this screencast, I discuss some of the most common methods and techniques that have to do with strings, arrays and hashes. This is also excellent for those coming from other languages.

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In this screencast, we continue on our task of creating a 'Stack Overflow' clone by adding more domain classes and relationships between them. We also cover how to test your classes using integration tests.

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