<!DOCTYPE html>
<title>SpeechRecognition onDeviceWebSpeechAvailable</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(async (t) => {
  const lang = "en-US";
  window.SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;
  const speechRecognition = new SpeechRecognition();

  // Ensure the onDeviceWebSpeechAvailable method exists.
  assert_true(
    "onDeviceWebSpeechAvailable" in speechRecognition,
    "SpeechRecognition should have the onDeviceWebSpeechAvailable method."
  );

  // Test that it returns a promise.
  const resultPromise = speechRecognition.onDeviceWebSpeechAvailable(lang);
  assert_true(
    resultPromise instanceof Promise,
    "onDeviceWebSpeechAvailable should return a Promise."
  );

  // Verify the resolved value is a boolean.
  const result = await resultPromise;
  assert_true(
    typeof result === "boolean",
    "The resolved value of the onDeviceWebSpeechAvailable promise should be a boolean."
  );

  // Verify that method returns false if on-device speech recognition is not installed.
  assert_equals(
    result,
    false,
    "onDeviceWebSpeechAvailable should resolve with `false` if on-device speech recognition is not installed."
  );
}, "SpeechRecognition.onDeviceWebSpeechAvailable resolves with a boolean value.");
</script>