test against JRuby and Rubinius

.travis.yml

@@ -10,6 +10,8 @@ script:
 rvm:
   - 1.9.3
   - 2.1.2
+  - rbx-2
+  - jruby
 env:
   matrix:
     - RAILS=3.2.18

Gemfile

@@ -1,5 +1,4 @@
 source 'https://rubygems.org'
-
 gemspec
 
 ACTIVE_ADMIN_PATH = File.dirname(__FILE__) unless defined?(ACTIVE_ADMIN_PATH)
@@ -21,6 +20,10 @@ gem 'devise'
 gem 'draper'
 gem 'pundit'
 
+gem RUBY_ENGINE =~ /jruby/ ? 'activerecord-jdbcsqlite3-adapter' : 'sqlite3'
+
+gem 'rubysl' if RUBY_ENGINE =~ /rbx/
+
 group :development do
   # Debugging
   gem 'pry'                # Easily debug from your console with `binding.pry`
@@ -50,6 +53,6 @@ group :test do
   gem 'parallel_tests'
   gem 'rails-i18n' # Provides default i18n for many languages
   gem 'rspec-rails'
+  gem 'rubinius-coverage' if RUBY_ENGINE =~ /rbx/ # colszowka/simplecov#250
   gem 'shoulda-matchers'
-  gem 'sqlite3'
 end

spec/integration/memory_spec.rb

@@ -1,6 +1,7 @@
 require 'spec_helper'
 
 describe "Memory Leak" do
+  JRuby.objectspace = true if RUBY_ENGINE =~ /jruby/
 
   def count_instances_of(klass)
     ObjectSpace.each_object(klass) { }