ect: '0%'},
]);

test_interpolation({
  property: 'text-decoration-thickness',
  from: '16px',
  to: '200%',
}, [
  {at: 0, expect: 'calc(0% + 16px)'},
  {at: 0.3, expect: 'calc(60% + 11.2px)'},
  {at: 0.6, expect: 'calc(120% + 6.4px)'},
  {at: 1, expect: '200%'},
]);

test_interpolation({
  property: 'text-decoration-thickness',
  from: '1em',
  to: '0px',
}, [
  {at: 0, expect: '16px'},
  {at: 0.3, expect: '11.2px'},
  {at: 0.6, expect: '6.4px'},
  {at: 1, expect: '0px'},
]);

test_interpolation({
  prope