Function before

src/test/resources/server.js:119–125

(context, name, fn)

function before(context, name, fn) {
  var method = context[name];
  context[name] = function() {
    fn.apply(this, arguments);
    return method.apply(this, arguments);
  };
}

before(io.engine, 'handleRequest', function(req, res) {
  // echo a header value