      {at: 0, expect: 'shape(from 5% 5px, curve to 10% 10px with 0% 80px, curve to 30% 20px with 20% 50px / 25% 70px)'},
        {at: 0.5, expect: 'shape(from 10% 10px, curve to 15% 5px with 5% 70px, curve to 25% 25px with 25% 45px / 10% 85px)'},
        {at: 1, expect: 'shape(from 15% 15px, curve to 20% 0px with 10% 60px, curve to 20% 30px with 30% 40px / -5% 100px)'},
        {at: 1.5, expect: 'shape(from 20% 20px, curve to 25% -5px with 15% 50px, curve to 15% 35px with 35% 35px / -20% 115px)'},
      ]);