2d.text.measure.selection-rects-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/offscreen/text/2d.text.measure.selection-rects-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>OffscreenCanvas test: 2d.text.measure.selection-rects-exceptions.tentative</title>

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

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

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

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

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

<script>

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

var t_pass = t.done.bind(t);

var t_fail = t.step_func(function(reason) {

    throw reason;

});

t.step(function() {

  var canvas = new OffscreenCanvas(100, 50);

  var ctx = canvas.getContext('2d');

  const kTexts = [

    'UNAVAILABLE',

    '🏁🎶🏁',

    '）（あ）（',

    '-abcd_',

    'اين المكتبة؟',

    'bidiالرياضيات'

  for (const text of kTexts) {

    const tm = ctx.measureText(text);

    // Handled by the IDL binding.

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

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

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

    // Thrown in TextMetrics.

    assert_throws_dom("IndexSizeError",

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

    assert_throws_dom("IndexSizeError",

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

    assert_throws_dom("IndexSizeError",

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

  t.done();

});

</script>