<!doctype html>
<meta charset="utf-8">
<title>CSSSkewY tests</title>
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#cssskewy">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/testhelper.js"></script>
<script>
'use strict';

const gInvalidTestCases = [
  { value: 'auto', desc: 'a keyword'},
  { value: 3.14, desc: 'a double'},
  { value: 0, desc: 'a unitless zero'},
  { value: '10deg', desc: 'a string angle'},
  { value: CSS.number(10), desc: 'a number CSSUnitValue'},
  { value: CSS.s(10), desc: 'a time dimension CSSUnitValue'},
  { value: new CSSMathSum(CSS.px(1)), desc: 'a CSSMathValue of length type' },
];

for (const {value, desc} of gInvalidTestCases) {
  test(() => {
    assert_throws_js(TypeError, () => new CSSSkewY(value));
  }, 'Constructing a CSSSkewY with ' + desc + ' throws a TypeError');
}

for (const {value, desc} of gInvalidTestCases) {
  test(() => {
    let skewY = new CSSSkewY(CSS.deg(0));
    assert_throws_js(TypeError, () => skewY.ay = value);
    assert_style_value_equals(skewY.ay, CSS.deg(0));
  }, 'Updating CSSSkewY.ay with ' + desc + ' throws a TypeError');
}

const gValidTestCases = [
  { value: CSS.deg(-3.14), desc: 'an angle CSSUnitValue' },
  { value: new CSSMathSum(CSS.deg(1)), desc: 'a CSSMathValue of angle type' },
];

for (const {value: ay, desc: ayDesc} of gValidTestCases) {
  test(() => {
    const skewY = new CSSSkewY(ay);
    assert_equals(skewY.ay, ay);
    assert_true(skewY.is2D);
  }, 'CSSSkewY can be constructed from ' + ayDesc);
}

for (const {value, desc} of gValidTestCases) {
  test(() => {
    let skewY = new CSSSkewY(CSS.deg(0));
    skewY.ay = value;
    assert_style_value_equals(skewY.ay, value);
  }, 'CSSSkewY.ay can be updated to ' + desc);
}

test(() => {
  let skewY = new CSSSkewY(CSS.deg(0));
  skewY.is2D = false;
  assert_true(skewY.is2D);
}, 'Modifying skewY.is2D is a no-op');

</script>
