third_party/blink/web_tests/wpt_internal/ai/language-model-api-prompt-context-overflow.https.any.js

// META: script=resources/utils.js
// META: script=resources/workaround-for-382640509.js
// META: timeout=long

promise_test(async () => {
  // Make sure the session could be created.
  const capabilities = await ai.languageModel.capabilities();
  const status = capabilities.available;
  // TODO(crbug.com/376789810): make it a PRECONDITION_FAILED if the model is
  // not ready.
  assert_true(status !== "no");
  // Start a new session.
  const session = await ai.languageModel.create();
  // Make sure there is something to evict.
  await session.prompt("Please write a sentence in English.");
  // Register the event listener.
  const promise = new Promise(resolve => {
    session.addEventListener("contextoverflow", () => {
      resolve(true);
    });
  });
  const promptString = await getPromptExceedingAvailableTokens(session);
  session.prompt(promptString);
  await promise;
}, "event listener should be triggered when the context overflows.");