Runs tests across Ruby installations in RVM
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RVM Tester

Runs tests across Ruby installations in RVM using concurrent worker processes. This library does not sandbox installations, and requires that you have already installed the necessary Ruby installations under RVM.

This project is heavily inspired by Travis-CI, but is meant to provide a more lightweight interface that can be run on your development machine or a dedicated server. Because there is no VM sandboxing, you can also have more control over your test environments, as well as your Ruby versions. Note that rvm-tester is not meant as a replacement to Travis-CI, but rather to be used in parallel with the service for extra coverage in different environments that might not be supported. In other words, this tool is not a CI, but it can be used to perform useful local debugging of tests under multiple Ruby environments.


In addition to installing this library with gem install rvm-tester, you will also need to setup RVM with the proper Ruby installations. RVM documentation can help with this, but a simple command to install 1.8.7 would be:

$ rvm install 1.8.7

rvm-tester also works with Bundler and Travis-CI meta-data files to setup your tests. See the Integration section below for more information on setting up your environment with these tools.


You can either use this library via the Rake task or directly via the Runner class:

Rake Task

Place the following in your Rakefile:

require 'rvm-tester' do |t|
  t.rubies = %w(1.8.6 1.8.7 1.9.2 1.9.3) # which versions to test (required!)
  t.bundle_install = true                # updates Gemfile.lock, default is true
  t.use_travis = true                    # looks for Rubies in .travis.yml (on by default)
  t.command = "bundle exec rake test"    # runs plain "rake" by default
  t.env = {"VERBOSE" => "1"}             # set any ENV vars
  t.num_workers = 5                      # defaults to 3
  t.verbose = true                       # shows more output, off by default

And simply run the task with rake suite. The output will look something like (output with verbose=false):

Installing Bundler and dependencies on 1.8.6,1.8.7,1.9.2,1.9.3...
Tests passed in 1.9.3 (1527 examples, 0 failures, 18.92sec)
Tests failed in 1.9.2 (1527 examples, 5 failures, 20.29sec)
Tests passed in 1.8.6 (1527 examples, 0 failures, 20.26sec)
Tests passed in 1.8.7 (1527 examples, 0 failures, 20.72sec)

Output for 1.9.2 (pid 11241 exit 1, cmd=rvm 1.9.2 do bundle exec rake test):

The Rake task also creates a task named "suite:deps" (or the task name + :deps) to perform only the bundle update portion of the task. This allows you to disable the automatic bundle_install setting, which can significantly speed up the time to run tests, while still enabling you to manually run the updater across all of your Ruby installations with the simple command:

$ rake suite:deps

Runner Class

You can also run the runner directly. The "t" object passed in the task above is the runner class, so you would set it up in the same way. You can also pass all attributes via the options hash.

runner = => %w(rbx 1.9.3), :verbose => true)



If you have a Gemfile and use the "bundle_install" setting in RVM tester (on by default), rvm-tester will also install the gem dependencies for your project before running the tests. If you do not use Bundler, you will have to make sure that each environment has the correct gems installed prior to testing. You can do this with the following command:

$ rvm all do gem install gem1 gem2 gem3 ...

Where "gem1 gem2 gem3 ..." are the dependencies needed by your project.


rvm-tester can automatically detect a .travis.yml file in your project and use it to detect Ruby versions and commands to execute. Note that currently, only the "rvm", "script" and "env" fields are used from the configuration file. If you do not want to use the .travis.yml file, set use_travis = false.


This library depends on RVM to control Ruby installations and mob_spawner to spawn worker processes.

License & Copyright

RVM Tester is licensed under the MIT license, © 2012 Loren Segal