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Guard watches files and runs a command after a file is modified. This allows you to automatically run tests in the background, restart your development server, reload the browser, and more.

Are you testing your JavaScript? Learn how to add specs using Jasmine. This episode also covers jQuery integration with jasmine-jquery.

Request specs in RSpec are a great way to ensure the entire application stack is working properly. Here I also show how to use capybara with integrated JavaScript testing using Selenium.

A/B Testing (or Split Testing) is a way to experiment with variations in an application to see the most effective option.

Sometimes bad code slips into production and triggers a 500 error. Learn how to be notified of this and resolve it through integration tests.

Pickle adds many convenient Cucumber steps for generating models. Also learn about table diffs in this episode.

Metric Fu is a compilation of several tools to help find areas of code that could be improved. In this episode I show you how to setup this tool on the railscasts.com source code.

There is a lot more to Cucumber than I showed in an earlier episode. See how to refactor complex scenarios in this episode.

Fixtures are external dependencies which can make tests brittle and difficult to read. In this episode I show a better alternative using factories to generate the needed records.

You can improve the readability and remove duplication in RSpec by adding matchers and macros. Learn how in this episode.