<!doctype html>
<meta charset="utf-8">
<title>Adding Two Numeric Types</title>
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#add-two-types">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/testhelper.js"></script>
<body>
<div id="log">
<script>
'use strict';

test(() => {
  const a = new CSSUnitValue(0, 'number');
  const b = new CSSUnitValue(0, 'px');
  assert_throws_js(TypeError, () => new CSSMathSum(a, b));
}, 'Adding two types with different non-null percent hints throws TypeError');

test(() => {
  const a = new CSSUnitValue(0, 'px');
  const b = new CSSUnitValue(0, 'px');
  const result = new CSSMathSum(a, b);
  assert_numeric_type_equals(result.type(), { length: 1 });
}, 'Adding two types with the same nonzero values returns same type');

test(() => {
  const a = new CSSUnitValue(0, 'number');
  const b = new CSSUnitValue(0, 'number');
  const result = new CSSMathSum(a, b);
  assert_numeric_type_equals(result.type(), { });
}, 'Adding two types with empty maps with returns empty map');

test(() => {
  const a = new CSSUnitValue(0, 'px');
  const b = new CSSUnitValue(0, 'percent');
  const result = new CSSMathSum(a, b);
  assert_numeric_type_equals(result.type(), { length: 1, percentHint: 'length' });
}, 'Adding a type with percent returns type with percent hint');

test(() => {
  const a = new CSSMathProduct(new CSSUnitValue(0, 'px'), new CSSUnitValue(0, 'px'));
  const b = new CSSUnitValue(0, 'percent');
  assert_throws_js(TypeError, () => new CSSMathSum(a, b));
}, 'Adding a type with percent 2 returns type with percent hint throws TypeError');

test(() => {
  const a = new CSSMathSum(new CSSUnitValue(0, 'px'), new CSSUnitValue(0, 'percent'));
  const b = new CSSUnitValue(0, 'px');
  const result = new CSSMathSum(a, b);
  assert_numeric_type_equals(result.type(), { length: 1, percentHint: 'length' });
}, 'Adding a type with a percent hint returns a type with the percent hint');

test(() => {
  const a = new CSSMathSum(new CSSUnitValue(0, 'px'), new CSSUnitValue(0, 'percent'));
  const b = new CSSMathSum(new CSSUnitValue(0, 'px'), new CSSUnitValue(0, 'percent'));
  const result = new CSSMathSum(a, b);
  assert_numeric_type_equals(result.type(), { length: 1, percentHint: 'length' });
}, 'Adding two types with the same percent hint returns a type with the percent hint');

</script>