docs: function Spec(runner, options) {
    Base.call(this, runner, options);
  
    var self = this;
    var indents = 0;
    var n = 0;
  
    function indent() {
      return Array(indents).join('  ');
    }
  
    runner.on(EVENT_RUN_BEGIN, function() {
      console.log();
    });
  
    runner.on(EVENT_SUITE_BEGIN, function(suite) {
      ++indents;
      console.log(color('suite', '%s%s'), indent(), suite.title);
    });
  
    runner.on(EVENT_SUITE_END, function() {
      --indents;
      if (indents === 1) {
        console.log();
      }
    });
  
    runner.on(EVENT_TEST_PENDING, function(test) {
      var fmt = indent() + color('pending', '  - %s');
      console.log(fmt, test.title);
    });
  
    runner.on(EVENT_TEST_PASS, function(test) {
      var fmt;
      if (test.speed === 'fast') {
        fmt =
          indent() +
          color('checkmark', '  ' + Base.symbols.ok) +
          color('pass', ' %s');
        console.log(fmt, test.title);
      } else {
        fmt =
          indent() +
          color('checkmark', '  ' + Base.symbols.ok) +
          color('pass', ' %s') +
          color(test.speed, ' (%dms)');
        console.log(fmt, test.title, test.duration);
      }
    });
  
    runner.on(EVENT_TEST_FAIL, function(test) {
      console.log(indent() + color('fail', '  %d) %s'), ++n, test.title);
    });
  
    runner.once(EVENT_RUN_END, self.epilogue.bind(self));
  }