<!doctype html>
<meta charset="utf-8">
<title>CSSSkew tests</title>
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#cssskew">
<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 CSSSkew(value, CSS.deg(0)));
    assert_throws_js(TypeError, () => new CSSSkew(CSS.deg(0), value));
  }, 'Constructing a CSSSkew with ' + desc + ' throws a TypeError');
}

for (const attr of ['ax', 'ay']) {
  for (const {value, desc} of gInvalidTestCases) {
    test(() => {
      let skew = new CSSSkew(CSS.deg(0), CSS.deg(0));
      assert_throws_js(TypeError, () => skew[attr] = value);
      assert_style_value_equals(skew[attr], CSS.deg(0));
    }, 'Updating CSSSkew.' + attr + ' 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: ax, desc: axDesc} of gValidTestCases) {
  for (const {value: ay, desc: ayDesc} of gValidTestCases) {
    test(() => {
      const skew = new CSSSkew(ax, ay);
      assert_equals(skew.ax, ax);
      assert_equals(skew.ay, ay);
      assert_true(skew.is2D);
    }, 'CSSSkew can be constructed from ' + axDesc + ' and ' + ayDesc);
  }
}

for (const attr of ['ax', 'ay']) {
  for (const {value, desc} of gValidTestCases) {
    test(() => {
      let skew = new CSSSkew(CSS.deg(0), CSS.deg(0));
      skew[attr] = value;
      assert_style_value_equals(skew[attr], value);
    }, 'CSSSkew.' + attr + ' can be updated to ' + desc);
  }
}

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

</script>
