Test with rake, like most everyone else.

Gemfile.lock

@@ -13,6 +13,7 @@ GEM
     crack (0.4.2)
       safe_yaml (~> 1.0.0)
     libv8 (3.16.14.3)
+    rake (10.3.2)
     ref (1.0.5)
     safe_yaml (1.0.3)
     therubyracer (0.12.1)
@@ -26,5 +27,6 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  rake
   ruby-clean-css!
   webmock

README.md

@@ -132,10 +132,7 @@ will now work like you expect.
 
 ## Contributing
 
-Pull requests are welcome. Please supply a test case with your PR. You
-typically run tests like this:
-
-    bundle exec ruby test/test_compressor.rb
+Pull requests are welcome. Please supply a test case with your PR.
 
 ## License
 

Rakefile

@@ -0,0 +1,9 @@
+require('rake/testtask')
+
+Rake::TestTask.new do |t|
+  t.libs += ['lib']
+  t.test_files = FileList['test/test_*.rb']
+  t.verbose = true
+end
+
+task(:default => :test)

ruby-clean-css.gemspec

@@ -15,6 +15,7 @@ Gem::Specification.new do |gem|
   gem.version = RubyCleanCSS::VERSION
   gem.add_dependency('therubyracer')
   gem.add_dependency('commonjs')
+  gem.add_development_dependency('rake')
   gem.add_development_dependency('webmock')
 
   # Append all submodule files to the list of gem files.