, 0, 0) 0px 0px 0px 0px inset'},
  {at: 1.5, expect: 'rgba(0, 0, 0, 0) -5px -10px 0px 0px, rgba(0, 0, 0, 0) -2.5px -15px 0px 0px inset'},
]);

// Test calc with comparison functions
test_interpolation({
  property: 'box-shadow',
  from: 'inset 0 0 0 0 black',
  to: 'inset 0 0 0 calc(max(10em, 20px) / 2) black',
}, [
  {at: -0.3, expect: 'rgb(0, 0, 0) 0px 0px 0px -4.5px inset'},
  {at: 0, expect: 'rgb(0, 0, 0) 0px 0px 0px 0px inset'},
  {at: 0.3, expect: 'rgb(0, 0, 0) 0px 0px 0px 4.5px inset'},
  {at: 0.6, e