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chromium/third_party/blink/web_tests/external/wpt/css/css-typed-om/stylevalue-subclasses/cssVariableReferenceValue.html 

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

test(() => {
  const result = new CSSVariableReferenceValue('--foo');
  assert_not_equals(result, null, 'a CSSVariableReferenceValue is created');
  assert_equals(result.variable, '--foo',
                'variable is same as passed by constructor');
  assert_equals(result.fallback, null, 'fallback');
}, 'CSSVariableReferenceValue can be constructed with no fallback');

test(() => {
  const result = new CSSVariableReferenceValue('--foo', null);
  assert_not_equals(result, null, 'a CSSVariableReferenceValue is created');
  assert_equals(result.variable, '--foo',
                'variable is same as passed by constructor');
  assert_equals(result.fallback, null, 'fallback');
}, 'CSSVariableReferenceValue can be constructed with null fallback');

test(() => {
  const result = new CSSVariableReferenceValue('--foo',
      new CSSUnparsedValue(['lemon']));
  assert_not_equals(result, null, 'a CSSVariableReferenceValue is created');
  assert_equals(result.variable, '--foo',
                'variable is same as passed by constructor');
  assert_not_equals(result.fallback, null, 'fallback');
  assert_style_value_equals(result.fallback, new CSSUnparsedValue(['lemon']),
                            'fallback is same as passed by constructor');
}, 'CSSVariableReferenceValue can be constructed with valid fallback');

</script>