docs: function Runner(suite) {
    var self = this;
    this._globals = [];
    this.suite = suite;
    this.total = suite.total();
    this.failures = 0;
    this.on('test end', function(test){ self.checkGlobals(test); });
    this.on('hook end', function(hook){ self.checkGlobals(hook); });
    this.grep(/.*/);
    this.globals(this.globalProps().concat(['errno']));
  }