   {at: 0.5, expect: 'shape(from 10% 10px, arc to 10% -20px of 15px 25px ccw small, arc by 20% -10px of 25px 25px rotate 150deg cw large, arc to 25% 20px of 10px 5px cw small)'},
        {at: 1, expect: 'shape(from 15% 15px, arc to 5% -25px of 20px 30px, arc by 25% -15px of 20px 20px rotate 270deg cw small, arc to 25% 20px of 10px 5px cw small)'},
        {at: 1.5, expect: 'shape(from 20% 20px, arc to 0% -30px of 25px 35px ccw small, arc by 30% -20px of 15px 15px rotate 390deg cw small, arc to 25% 20px of 1