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

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

  // Test that it returns a promise.
  const validResultPromise = speechRecognition.installOnDeviceSpeechRecognition(validLang);
  assert_true(
    validResultPromise instanceof Promise,
    "installOnDeviceSpeechRecognition should return a Promise."
  );

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

  // Verify that the method returns true when called with a supported language code.
  assert_equals(
    validResult,
    true,
    "installOnDeviceSpeechRecognition should resolve with `true` when called with a supported language code."
  );

  // Test that it returns a promise.
  const invalidResultPromise = speechRecognition.installOnDeviceSpeechRecognition(invalidLang);
  const invalidResult = await invalidResultPromise;
  assert_equals(
    invalidResult,
    false,
    "installOnDeviceSpeechRecognition should resolve with `false` when called with an unsupported language code."
  );
}, "SpeechRecognition.installOnDeviceSpeechRecognition resolves with a boolean value.");
</script>