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chromium/third_party/blink/web_tests/external/wpt/html/canvas/element/text/2d.text.measure.selection-rects-exceptions.tentative.html 

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>Canvas 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>
<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
<body class="show_output">

<h1>2d.text.measure.selection-rects-exceptions.tentative</h1>
<p class="desc">Check that TextMetrics::getSelectionRects() 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::getSelectionRects() throws when using invalid indexes.");
_addTest(function(canvas, ctx) {

  const kTexts = [
    'UNAVAILABLE',
    '🏁🎢🏁',
    'οΌ‰οΌˆγ‚οΌ‰οΌˆ',
    '-abcd_'
  ]

  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) );
  }

});
</script>