decimal.tentative.https.window.js

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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/response-constraint/regex/decimal.tentative.https.window.html - WPT Dashboard Interop Dashboard

// META: title=Language Model Response Regex - Decimal

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

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

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

// META: timeout=long

'use strict';

promise_test(async t => {

  await ensureLanguageModel();

  const session = await createLanguageModel();

  const regex = /^-?\d(\.\d+)?$/;

  const response = await session.prompt(

      'Derive a rating between -1.0 and 1.0 from "Absolutely the best meal ever!"',

      {responseConstraint: regex});

  assert_true(typeof response === 'string');

  assert_true(regex.test(response),

              `Response "${response}" should match regex ${regex}`);

  const num = parseFloat(response);

  assert_false(isNaN(num),

               `Response "${response}" should parse to a valid decimal`);

  assert_greater_than_equal(num, -1.0, 'Response should be >= -1.0');

  assert_less_than_equal(num, 1.0, 'Response should be <= 1.0');

}, 'Prompt should work with a decimal regex constraint.');