function Dot (runner) {
  Base.call(this, runner);

  var self = this;
  var width = Base.window.width * 0.75 | 0;
  var n = -1;

  runner.on('start', function () {
    process.stdout.write('\n');
  });

  runner.on('pending', function () {
    if (++n % width === 0) {
      process.stdout.write('\n  ');
    }
    process.stdout.write(color('pending', Base.symbols.comma));
  });

  runner.on('pass', function (test) {
    if (++n % width === 0) {
      process.stdout.write('\n  ');
    }
    if (test.speed === 'slow') {
      process.stdout.write(color('bright yellow', Base.symbols.dot));
    } else {
      process.stdout.write(color(test.speed, Base.symbols.dot));
    }
  });

  runner.on('fail', function () {
    if (++n % width === 0) {
      process.stdout.write('\n  ');
    }
    process.stdout.write(color('fail', Base.symbols.bang));
  });

  runner.on('end', function () {
    console.log();
    self.epilogue();
  });
}
Initialize a new `Dot` matrix test reporter.

@api public
@param {Runner} runner