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

  var self = this
    , stats = this.stats
    , width = Base.window.width * .75 | 0
    , n = 0;

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

  runner.on('pending', function(test){
    process.stdout.write(color('pending', Base.symbols.dot));
  });

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

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

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

@param {Runner} runner
@api public