
  assert_equals(getComputedValueFor('invalid_digits_calc_0_plus_1'), 'none');
}, 'Computed value for `text-combine-upright: digits calc(0 + 1)` is `none`');

test(function () {
  assert_equals(getComputedValueFor('invalid_digits_calc_2_plus_3'), 'none');
}, 'Computed value for `text-combine-upright: digits calc(2 + 3)` is `none`');

test(function () {
  assert_equals(getComputedValueFor('invalid_digits_calc_4_minus_3'), 'none');
}, 'Computed value for `text-combine-upright: digits calc(4 - 3)` is `none`');