sxg-navigation-timing.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:
- /signed-exchange/sxg-navigation-timing.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Navigation timing of SignedHTTPExchange</title>

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

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

<script src="/common/get-host-info.sub.js"></script>

<script src="./resources/sxg-util.js"></script>

<body>

<script>

promise_test(async (t) => {

  const sxgUrl = get_host_info().HTTPS_ORIGIN + '/signed-exchange/resources/sxg/sxg-navigation-timing.sxg';

  const message = await openSXGInIframeAndWaitForMessage(t, sxgUrl);

  assert_false(message.is_fallback);

  let timing = JSON.parse(message.timing);

  let originalContent = await fetch('resources/sxg-navigation-timing.html').then(resp => resp.arrayBuffer());

  assert_equals(timing.decodedBodySize, originalContent.byteLength);

  assert_equals(timing.encodedBodySize, computeMiceLength(originalContent.byteLength, 100));

  // TODO(https://crbug.com/928589): Test other fields too.

}, 'Navigation timing of SignedHTTPExchange');

// Returns content length after MI encode.

function computeMiceLength(len, recordSize) {

  const recordSizeLen = 8;

  const sha256DigestLength = 32;

  return recordSizeLen + len + Math.floor(len / recordSize) * sha256DigestLength;

</script>

</body>