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RSpec testing with different rubies

03 Feb 2014 / ruby

I'm working on Ruby gem for Databox API and I needed a way to test it locally under different versions of Ruby.

What is Databox?

Databox is the mobile dashboard for executives and the most advanced business intelligence tool for smart-phones. Basically they provide endpoint to witch you can push your data and their wonderful client will display it perfectly on your smart-phone. Check out their homepage for more information.

RVM to help

The easies way is to use different Rubies with different gemsets and then execute RSpec inside it.

  1. Install Rubies that you want to use
  rvm install ruby-1.9.3
  rvm install ruby-2.0.0
  1. Create RVM gemsets
  rvm use --create ruby-1.9.3@databox
  rvm use --create ruby-2.0.0@databox

Then write scripts that looks somethings like this.

#!/usr/bin/env bash

# Define different Gemsets
declare -a SETS=(\
  'ruby-1.9.3-p484@databox' \
  'ruby-2.0.0-p353@databox' \
  # Add others here

# Loop over Gemsets and exec RSpec
for r in "${SETS[@]}"; do
  set -o verbose
  echo "Testing $r"

  rvm $r exec bundle install --quiet
  rvm $r exec bundle exec rspec --fail-fast --format=progress

The Bash script will loop over SETS and execute RSpec for each set. The output will look something like this.

Testing ruby-1.9.3-p484@databox

Finished in 0.16668 seconds
20 examples, 0 failures
Testing ruby-2.0.0-p353@databox

Finished in 0.15869 seconds
20 examples, 0 failures

And thats it. :)

P.s.: If you are using Travis for your CI. You can easily add this to your .travis.yml. and Travis will run your code with different versions of Ruby each time you push your code. Read more about this functionality under choosing Ruby versions and implementations to test against.

  - 1.9.3
  - 2.0.0

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