overflow.tentative.https.window.js

Enable keyboard shortcuts

This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /ai/language-model/prompt/context/overflow.tentative.https.window.html - WPT Dashboard Interop Dashboard

// META: title=Language Model Prompt Context Overflow

// 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 promise = new Promise(resolve => {

    session.addEventListener('contextoverflow', resolve);

});

  // Make sure there is something to evict.

  const kLongPrompt = kTestPrompt.repeat(10);

  const usage = await session.measureContextUsage(kLongPrompt);

  assert_greater_than(session.contextWindow, usage);

  await session.append(kLongPrompt);

  assert_greater_than(session.contextUsage, 0);

  // Generate a repeated kLongPrompt string that exceeds contextWindow.

  const repeatCount = session.contextWindow / session.contextUsage;

  const promptString = kLongPrompt.repeat(repeatCount);

  // The prompt promise succeeds, while causing older input to be evicted.

  await Promise.all([promise, session.prompt(promptString)]);

}, 'The `contextoverflow` event is fired when overall usage exceeds the context window');