2d.text.measure.text-clusters-exceptions.tentative.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/text/2d.text.measure.text-clusters-exceptions.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->

<meta charset="UTF-8">

<title>Canvas test: 2d.text.measure.text-clusters-exceptions.tentative</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/html/canvas/resources/canvas-tests.js"></script>

<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">

<body class="show_output">

<h1>2d.text.measure.text-clusters-exceptions.tentative</h1>

<p class="desc">Check that TextMetrics::getTextClusters() throws when using invalid indexes.</p>

<p class="output">Actual output:</p>

<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>

<ul id="d"></ul>

<script>

var t = async_test("Check that TextMetrics::getTextClusters() throws when using invalid indexes.");

_addTest(function(canvas, ctx) {

  const kTexts = [

    'UNAVAILABLE',

    '🏁🎶🏁',

    '）（あ）（',

    '-abcd_'

  for (const text of kTexts) {

    const tm = ctx.measureText(text);

    // Handled by the IDL binding.

    assert_throws_js(TypeError, () => tm.getTextClusters(-1, 0) );

    assert_throws_js(TypeError, () => tm.getTextClusters(0, -1) );

    assert_throws_js(TypeError, () => tm.getTextClusters(-1, -1) );

    // Thrown in TextMetrics.

    assert_throws_dom("IndexSizeError",

            () => tm.getTextClusters(text.length, 0) );

    assert_throws_dom("IndexSizeError",

            () => tm.getTextClusters(0, text.length + 1) );

    assert_throws_dom("IndexSizeError",

            () => tm.getTextClusters(text.length, text.length + 1) );

});

</script>