capture

# File activesupport/lib/active_support/testing/stream.rb, line 26
        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
          captured_stream.read
        ensure
          captured_stream.close
          captured_stream.unlink
          stream_io.reopen(origin_stream)
        end