SpeechGrammarList-item.https.html

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This test has a WPT meta file that disables it given conditions:
- os == "android" : SpeechGrammarList is not built on Android, see dom/webidl/moz.build
This WPT test may be referenced by the following Test IDs:
- /speech-api/SpeechGrammarList-item.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>SpeechGrammarList item()</title>

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

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

<script>

window.SpeechGrammarList = window.SpeechGrammarList || window.webkitSpeechGrammarList;

test(() => {

  const list = new SpeechGrammarList();

  assert_equals(list.length, 0, 'length of a new list');

  assert_equals(list.item(0), null, 'item(0)');

  assert_equals(list.item(255), null, 'item(255)');

  assert_equals(list[255], undefined, 'list[255]');

}, 'item() returns null for an out-of-range index');

test(() => {

  const list = new SpeechGrammarList();

  list.addFromString('#ABNF 1.0 UTF-8; language en-US; root $hello;');

  assert_equals(list.length, 1, 'length after addFromString()');

  assert_true(list.item(0) instanceof SpeechGrammar, 'item(0)');

  assert_equals(list.item(1), null, 'item(1)');

}, 'item() returns the grammar at an in-range index');

</script>