spec_helper.rb

module UserTempDir
  def self.extended(example_group)
    example_group.use_tempdir(example_group)
  end

  def self.included(example_group)
    example_group.extend self
  end

  def use_tempdir(describe_block)
    describe_block.before :all do
      @old_pwd = Dir.pwd
      @root_dir = Dir.mktmpdir
      Dir.chdir @root_dir
    end

    describe_block.after :all do
      FileUtils.remove_entry_secure @root_dir
      Dir.chdir @old_pwd
    end
  end

  def mkdir(dirpath)
    path = "#{@root_dir}/#{dirpath}"
    Dir.mkdir path unless File.exists? path
    path
  end

  def write_file(filepath, content)
    path = "#{@root_dir}/#{filepath}"
    open(path, "w") do |f|
      f.puts content
    end
    path
  end
end

RSpec.configure do |config|
  config.include UserTempDir
end