Module ActiveSupport::Testing::Isolation::Forking

# File activesupport/lib/active_support/testing/isolation.rb, line 94
def run_in_isolation(&blk)
  read, write = IO.pipe

  pid = fork do
    read.close
    proxy = ProxyTestResult.new
    retval = yield proxy
    write.puts [Marshal.dump([retval, proxy])].pack("m")
    exit!
  end

  write.close
  result = read.read
  Process.wait2(pid)
  return result.unpack("m")[0]
end