wrap mocha in child_process.spawn() to grab JSON output

express-mocha.js

/* npm insatll -g mocha
 * npm install express
 * node ./<this>
 * put tests in ./test/ and they can be called by hitting http://localhost:3030/test/:file
 * you can test all tests by hitting http://localhost:3030/test/all
 */
var express = require('express'),
    app = express();

var spawn = require('child_process').spawn;

var express_mocha = function(req, res) {
  var stdout, stderr, _this, opts = [ '-R', 'json' ];
  if (req.params.file) opts.push('./test/'+req.params.file+'.js');
  _this = spawn('mocha', opts);
  _this.stdout.on('data', function(data) { stdout = (stdout||'') + data; });
  _this.stderr.on('data', function(data) { stderr = (stderr||'') + data; });
  _this.on('close', function() {
    if (stdout) res.send(JSON.parse(stdout));
    else res.send(stderr);
  });
};

app.get('/test/all', express_mocha);

app.get('/test/:file', express_mocha);

app.listen(3030);