How to test bundled gems?

test-bundled-gem.rb

require "rubygems"

srcdir = File.expand_path("YOUR RUBY SOURCE DIRECTORY")

Dir.glob(File.join(srcdir, "gems", "*.gem")) do |gem|
  tmp = File.basename(gem, ".gem").split(/-/)
  version = tmp.pop
  name = tmp.join('-')

  spec = Gem::Specification.find{|s| s.name == name && s.version.version == version}
  if spec
    testdir = File.join(spec.gem_dir, "test")
    if File.directory?(testdir) &&
       (spec.name == "test-unit" || spec.name == "minitest" ||
        spec.dependencies.find{|dep| dep.name == "test-unit" || dep.name == "minitest"})
      puts "testing #{spec.name} #{spec.version} ..."
      Dir.glob(File.join(testdir, "test*.rb")).each do |t|
        system("ruby #{t}")
      end
    end
  end
end