Add minimal test suite. Refs #291

Gemfile

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+source 'https://rubygems.org'
+
+group :test do
+  gem 'rake'
+  gem 'minitest', '5.3'
+  gem 'minitest-colorize'
+  gem 'mocha', '0.14.0', :require => false
+end

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    metaclass (0.0.4)
+    minitest (5.3.0)
+    minitest-colorize (0.0.5)
+      minitest (>= 2.0)
+    mocha (0.14.0)
+      metaclass (~> 0.0.1)
+    rake (10.3.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  minitest (= 5.3)
+  minitest-colorize
+  mocha (= 0.14.0)
+  rake

Rakefile

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+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.pattern = "test/**/*_test.rb"
+  t.libs << 'test'
+end
+
+task :default => :test

test/Casks/compliance_test.rb

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+require 'test_helper'
+
+describe "Casks" do
+  Cask.all.reject {|c| c.is_a?(TestCask) }.each do |cask|
+    describe "#{cask}" do
+      it "passes audit" do
+        audit = Cask::Audit.new(cask)
+        audit.run!
+        audit.errors.must_equal [], "[#{cask}] Cask audit must be error free"
+        audit.warnings.must_equal [], "[#{cask}] Cask audit must be warning free"
+      end
+    end
+  end
+end

test/test_helper.rb

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+require 'bundler'
+require 'bundler/setup'
+
+# add cask lib to load path
+brew_cask_path = Pathname.new(File.expand_path(__FILE__+'/../../../homebrew-cask/'))
+lib_path = brew_cask_path.join('lib')
+
+$:.push(lib_path)
+
+# add homebrew to load path
+homebrew_path = Pathname(`brew --prefix`.chomp)
+homebrew_path = Pathname('/usr/local') unless homebrew_path.exist?
+$:.push(homebrew_path.join('Library', 'Homebrew'))
+
+# require homebrew testing env
+require 'test/testing_env'
+
+# must be called after testing_env so at_exit hooks are in proper order
+require 'minitest/autorun'
+# todo, re-enable minitest-colorize, broken under current test environment for unknown reasons
+# require 'minitest-colorize'
+
+# our baby
+require 'cask'
+
+# pretend like we installed the cask tap
+project_root = Pathname.new(File.expand_path("#{File.dirname(__FILE__)}/../"))
+taps_dest = HOMEBREW_LIBRARY/"Taps/caskroom"
+
+# create directories
+FileUtils.mkdir_p taps_dest
+HOMEBREW_PREFIX.join('bin').mkdir
+
+FileUtils.ln_s project_root, taps_dest/"homebrew-cask"
+
+# Common superclass for tests casks for when we need to filter them out
+class TestCask < Cask; end