You can build XHTML and CSS validation right into your Ruby on Rails Rspec tests - thanks to a plugin called be_valid_asset.

Combine this with autotest and voila - you can be alerted the moment you change something in the view code that breaks your site’s valid markup.

Take this one step further and add your tests into your Capistrano deployment script - and you literally cannot deploy your site when it is in a state that is not standards-compliant.

Get started by installing the be_valid_asset gem (or plugin), and inserting the following line into your Rspec spec_helper.rb file:

config.include BeValidAsset

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I found a really good way to speed up your workflow: a library called autotest that automatically (and intelligently) triggers the tests in your Ruby on Rails project whenever it detects files that are modified.

This is great because it means that you can fiddle around with your code with a greater level of confidence, because you know that the moment you break existing functionality, you will be alerted.

You can install autotest simply by installing the ZenTest gem:

gem install ZenTest

And then type the following from your Rails project directory:

autotest -rails

I even found a way in which you can set up autotest to use your desktop notification system to alert you of when tests have passed or failed, making it even more visible to you as you code. I am running Ubuntu, so I set it up through the Gnome notification system, but according to this article on getting started with autotest you can also enable this on OSX and Windows.

Deploying your web app to multiple environments (e.g. development, test, production) is a cinch using Capistrano. Let me show you how.

Capistrano is written in Ruby, so this is your main pre-requisite. Get Ruby and Rubygems installed, and then simply type the following command to install the Capistrano gem:

gem install capistrano

Getting your application ready for deployment starts with the following command, issued from inside your app’s top-level directory:

capify .

This two files: Capfile and config/deploy.rb. The latter is where we are going to tell Capistrano how we want it to deploy our application.

set :application, "myapp"
set :repository,  "git@github.com:johngrimes/myapp.git"
set :scm, "git"

The first part of our deploy.rb gives our app a name and tells Capistrano where to pull the latest copy of our app from. This example has us using Github as our source code repository.

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