urrentTime: 0,    progress: 1 },
                  { currentTime: 1000, progress: 1 },
                  { currentTime: 1001, progress: 0.5 },
                  { currentTime: 2999, progress: 1 },
                  { currentTime: 3000, progress: 0.5 },
                  { currentTime: 3500, progress: 0.5 }
                ]
  },
  {
    description: 'Test bounds point of step-start easing ' +
                 'with alternate-reverse direction',
    effect:     {
                  duration: 1000,
           