require "rake/testtask" task default: :test task :package Rake::TestTask.new do |t| t.libs << "test" t.pattern = "test/**/*_test.rb" t.warning = true t.verbose = true t.ruby_opts = ["--dev"] if defined?(JRUBY_VERSION) end namespace :test do task :isolated do Dir.glob("test/**/*_test.rb").all? do |file| sh(Gem.ruby, "-w", "-Ilib:test", file) end or raise "Failures" end end