Unneeded processing in _spawnMochaWithListeners?

[plroebuck]

Description

_spawnMochaWithListeners function within file "test/integration/helpers.js".

Code in question is here, but relevant portion copied below.

  mocha.on('close', function(code) {
    fn(null, {
      output: output.split('\n').join('\n'),    // <=== why?
      code: code
    });
});

Need to determine if there's any reason for the .split('\n').join('\n') portion.
If so, document why; otherwise, remove the unnecessary post-processing of output.

Additional Information

See PR #1675.