module Tapioca::Helpers::Test::Isolation::Forking

def run_in_isolation(&_blk)
  read, write = IO.pipe
  read.binmode
  write.binmode
  this = T.cast(self, Minitest::Test)
  pid = fork do
    read.close
    yield
    begin
      if this.error?
        this.failures.map! do |e|
          Marshal.dump(e)
          e
        rescue TypeError
          ex = Exception.new(e.message)
          ex.set_backtrace(e.backtrace)
          Minitest::UnexpectedError.new(ex)
        end
      end
      test_result = defined?(Minitest::Result) ? Minitest::Result.from(self) : this.dup
      result = Marshal.dump(test_result)
    end
    write.puts [result].pack("m")
    write.close
    exit!(false)
  end
  write.close
  result = read.read
  read.close
  Process.wait2(T.must(pid))
  T.must(result).unpack1("m")
end