File: test_bug1921817.html

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<!DOCTYPE HTML>
<html>
<head>
  <title></title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<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>