MultiRails

by Relevance, http://thinkrelevance.com
   Rob Sanheim - MultiRails lead

MultiRails lets you test your Rails plugin or app against many versions of Rails in one sweep.

DESCRIPTION

MultiRails allows easy testing against multiple versions of Rails for your Rails specific gem or plugin. It also has tentative support testing Rails applications against multiple versions of Rails.

Use MultiRails to hook in Rails 2.0 testing in your continuous integration. Still working on Rails 2.0 support? Use MultiRails to see where your test suite falls down against the latest and greatest versions of Rails.

MultiRails was initially developed by members of Relevance while developing Streamlined against edge Rails. To see how Streamlined uses MultiRails, go to trac.streamlinedframework.org.

FEATURES:

easily test plugins/extensions using a require from your test_helper.rb and a require in your RakeFile
rake tasks to test against a specified version of Rails, the latest version, or all versions
tentative support for testing plain Rails apps against multiple versions of Rails
Uses rubygems for version management of Rails

TODOs:

improve docs on how to override what files are required by multi_rails
maybe add ability to load plain Rails versions – ie checked out copies not in RubyGems

NOTES:

(__For Rails apps only__) multi_rails will rename your vendor/rails directory to vendor/rails.off if it finds one within your rails app. We have to do this to make Rails fall back to RubyGems rails. Multi_rails will rename back to the correct vendor/rails when done testing, so it will not interrupt your app in normal use.
(__For Rails apps only__) multi_rails needs to add a line to top of your environment.rb to hook into – see the instructions below for more details

REQUIREMENTS:

Ruby 1.8.5 or higher
Rubygems
Rails 1.2.1 or higher
Rails 2.0.0+ is not yet officially supported
at least one copy of Rails installed via rubygems.

INSTALLING FOR RAILS APPS

install the plugin, which will copy the multi_rails_runner into your script folder on install.

grab the tar here: http://github.com/relevance/multi_rails/tarball/master
extract it inside vendor/plugins

Run the multi_rails bootstrap command to get your Rails app ready to go with multi_rails - this will add a require line to the top of your environment.rb needed for multi_rails to work right.
```
script/multi_rails_runner bootstrap
```
Run your tests against all versions of Rails installed (the default):
```
script/multi_rails_runner
```
or run our tests against the most recent version of Rails you have installed:
```
script/multi_rails_runner latest
```
or just a specific version:
```
MULTIRAILS_RAILS_VERSION=1.2.5 script/multi_rails_runner one
```

INSTALLING FOR PLUGINS

Install multi_rails
```
sudo gem install multi_rails
```
In your projects Rakefile, require the multi_rails Rake tasks.

require “load_multi_rails_rake_tasks”

Run rake -T to verify you see the multi_rails tasks.

rake -T multi_rails
# should see   "rake test:multi_rails:all, rake test:multi_rails:latest...etc"

In your test_helper, require multi_rails_init before any rails specific requires (activerecord, actioncontroller, activesupport, etc).

require ‘multi_rails_init’
Run the multi_rails:all rake task to run your test suite against all versions of Rails you have installed via gems. Install other versions of Rails using rubygems to add them to your test suite.
For changing the Rails version under test, set the environment variable MULTIRAILS_RAILS_VERSION to version you want, and run the multi_rails:one task or just run a test class directly.

HELP

Join the mailing list! - groups.google.com/group/multi_rails
Rails plugin testing is pretty solid, but rails app testing is still new. Post issues to the mailing list.
Getting gem activation errors? Post to the list with how you are using multi_rails, and I’ll try to help.

URLs

Log bugs, issues, and suggestions on Lighthouse: relevance.lighthouseapp.com/projects/18695-multirails/
rdocs thinkrelevance.rubyforge.org/multi_rails/
mailing list groups.google.com/group/multi_rails
view source github.com/relevance/multi_rails/tree/master
get source git clone git://github.com/relevance/multi_rails.git

LICENSE:

(The MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ‘Software’), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ‘AS IS’, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.