test_bug1921817.html

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<head>

  <title></title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

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<body>

<script>

// Bug 1924775 - ESLint doesn't yet know about `ImageDecoder`.

/* globals ImageDecoder:false */

async function test() {

  const imgResponse = await fetch("bug1921817.jpg");

  const decoder = new ImageDecoder({

    data: imgResponse.body,

    type: "image/jpeg",

});

  // Should download all the data and decode metadata just fine.

  await decoder.completed;

  await decoder.tracks.ready;

  is(decoder.tracks.length, 1, "Should have one track");

  is(decoder.tracks[0].frameCount, 1, "Should have a single frame");

  try {

    await decoder.decode();

    ok(false, "Expected to fail to decode image")

  } catch (e) {

    is(e.code, DOMException.INVALID_STATE_ERR, "Should throw InvalidStateError");

  return Promise.resolve();

async function initTest() {

  SimpleTest.waitForExplicitFinish();

  try {

    await test();

  } catch (e) {

    ok(false, "Unexpected error " + e);

  } finally {

    SimpleTest.finish();

initTest();

</script>

</body>

</html>