capture

# File activesupport/lib/active_support/testing/stream.rb, line 24
      def capture(stream)
        stream = stream.to_s
        captured_stream = Tempfile.new(stream)
        stream_io = eval("$#{stream}")
        origin_stream = stream_io.dup
        stream_io.reopen(captured_stream)

        yield

        stream_io.rewind
        return captured_stream.read
      ensure
        captured_stream.close
        captured_stream.unlink
        stream_io.reopen(origin_stream)
      end