language-model-append.tentative.https.window.js

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This test has a WPT meta file that expects 4 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /ai/language-model/language-model-append.tentative.https.window.html - WPT Dashboard Interop Dashboard

// META: title=Language Model Append

// META: script=/resources/testdriver.js

// META: script=/resources/testdriver-vendor.js

// META: script=../resources/util.js

// META: timeout=long

'use strict';

promise_test(async () => {

  await ensureLanguageModel();

  const session = await createLanguageModel();

  const result = await session.append(kTestPrompt);

  assert_equals(result, undefined);

}, 'Simple LanguageModel.append() call');

promise_test(async () => {

  await ensureLanguageModel();

  const session = await createLanguageModel();

  assert_equals(session.contextUsage, 0);

  const promptUsage = await session.measureContextUsage(kTestPrompt);

  assert_greater_than(promptUsage, 0);

  await session.append(kTestPrompt);

  assert_equals(session.contextUsage, promptUsage);

}, 'Check contextUsage increases from a simple LanguageModel.append() call');

promise_test(async (t) => {

  await ensureLanguageModel();

  const session = await createLanguageModel();

  assert_equals(session.contextUsage, 0);

  await session.append([]);

  assert_equals(session.contextUsage, 0);

  // Invalid input should be stringified.

  await session.append({});

  assert_greater_than(session.contextUsage, 0);

}, 'Check empty Object input for LanguageModel.append()');

promise_test(async t => {

  await ensureLanguageModel();

  const session = await createLanguageModel();

  const promptString = kTestPrompt.repeat(session.contextWindow);

  const usage = await session.measureContextUsage(promptString);

  await promise_rejects_quotaexceedederror(

      t, session.append(promptString), usage, session.contextWindow);

}, 'Test that append input exceeding the total context window rejects');