_interpolation({
  property: 'box-shadow',
  from: '15px 10px 5px 6px black',
  to: '-15px -10px 25px -4px orange',
}, [
  {at: -0.3, expect: 'rgb(0, 0, 0) 24px 16px 0px 9px'},
  {at: 0, expect: 'rgb(0, 0, 0) 15px 10px 5px 6px'},
  {at: 0.3, expect: 'rgb(77, 50, 0) 6px 4px 11px 3px'},
  {at: 0.6, expect: 'rgb(153, 99, 0) -3px -2px 17px 0px'},
  {at: 1, expect: 'rgb(255, 165, 0) -15px -10px 25px -4px'},
  {at: 1.5, expect: 'rgb(255, 248, 0) -30px -20px 35px -9px'},
]);

test_interpolation({
  property: 'box-