ntTime: 0,    progress: 1 },
                  { currentTime: 1000, progress: 1 },
                  { currentTime: 1001, progress: 0.5 },
                  { currentTime: 1499, progress: 0.5 },
                  { currentTime: 1500, progress: 1 },
                  { currentTime: 1999, progress: 1 },
                  { currentTime: 2000, progress: 0.5 },
                  { currentTime: 2500, progress: 0.5 }
                ]
  },
  {
    description: 'Test bounds point of step(4, start) easing ' +
      