  fill: 'both',
                  easing: 'steps(2, jump-both)'
                },
    conditions: [
                  { currentTime: 0,    progress: 0 },
                  { currentTime: 999,  progress: 0 },
                  { currentTime: 1000, progress: 1/3 },
                  { currentTime: 1499, progress: 1/3 },
                  { currentTime: 1500, progress: 2/3 },
                  { currentTime: 2000, progress: 1 }
                ]
  },
  {
    description: 'Test bounds point of steps(jump-both)