Remove implicit test-only behavior for LiveRegionController.

src/date-range-picker/__tests__/date-range-picker.test.tsx

@@ -9,6 +9,7 @@ import { warnOnce } from '@cloudscape-design/component-toolkit/internal';
 import DateRangePicker, { DateRangePickerProps } from '../../../lib/components/date-range-picker';
 import FormField from '../../../lib/components/form-field';
 import TestI18nProvider from '../../../lib/components/i18n/testing';
+import { LiveRegionController } from '../../../lib/components/internal/components/live-region/controller.js';
 import { NonCancelableEventHandler } from '../../../lib/components/internal/events';
 import createWrapper from '../../../lib/components/test-utils/dom';
 import DateRangePickerWrapper from '../../../lib/components/test-utils/dom/date-range-picker';
@@ -18,6 +19,8 @@ import { isValidRange } from './is-valid-range';
 
 import segmentedStyles from '../../../lib/components/segmented-control/styles.css.js';
 
+LiveRegionController.defaultMinDelay = 0;
+
 jest.mock('@cloudscape-design/component-toolkit/internal', () => ({
   ...jest.requireActual('@cloudscape-design/component-toolkit/internal'),
   warnOnce: jest.fn(),

src/flashbar/__tests__/flashbar.test.tsx

@@ -7,6 +7,7 @@ import { disableMotion } from '@cloudscape-design/global-styles';
 
 import Button from '../../../lib/components/button';
 import Flashbar, { FlashbarProps } from '../../../lib/components/flashbar';
+import { LiveRegionController } from '../../../lib/components/internal/components/live-region/controller.js';
 import createWrapper from '../../../lib/components/test-utils/dom';
 import { mockInnerText } from '../../internal/analytics/__tests__/mocks';
 import { createFlashbarWrapper, findList, testFlashDismissal } from './common';
@@ -24,6 +25,8 @@ jest.mock('../../../lib/components/internal/hooks/use-visual-mode', () => {
   };
 });
 
+LiveRegionController.defaultMinDelay = 0;
+
 mockInnerText();
 
 const noop = () => void 0;

src/internal/components/live-region/controller.ts

@@ -1,12 +1,8 @@
 // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-import { isTest } from '../../is-development.js';
-
 import styles from './styles.css.js';
 
-const DEFAULT_MIN_DELAY = isTest ? 0 : 2000;
-
 /**
  * The controller singleton that manages a single live region container. It has a timer and
  * a queue to make sure announcements don't collide and messages are debounced correctly.
@@ -15,7 +11,14 @@ const DEFAULT_MIN_DELAY = isTest ? 0 : 2000;
  *
  * @see https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Live_Regions
  */
-class LiveRegionController {
+export class LiveRegionController {
+  /**
+   * The default delay for announcements when no delay is explicitly provided.
+   * During unit testing, you can import this and explicitly set it to 0 to make
+   * the live region update the DOM without waiting for a timer.
+   */
+  public static defaultMinDelay = 2000;
+
   private _element: HTMLElement | undefined;
   private _timeoutId: number | undefined;
   private _lastAnnouncement = '';
@@ -52,7 +55,7 @@ class LiveRegionController {
     }
   }
 
-  announce(message: string, minDelay = DEFAULT_MIN_DELAY) {
+  announce(message: string, minDelay = LiveRegionController.defaultMinDelay) {
     this._nextMessages.add(message);
 
     if (this._nextDelay < minDelay) {

src/internal/is-development.ts

@@ -19,10 +19,3 @@ declare const process: { env: { NODE_ENV?: string } };
  * and remove the conditional statement for production bundles.
  */
 export const isDevelopment = process.env.NODE_ENV !== 'production';
-
-/**
- * Whether the execution environment is unit testing, like Jest or Vitest.
- * Use this sparingly - components shouldn't behave radically differently in
- * test environments.
- */
-export const isTest = process.env.NODE_ENV === 'test';

src/s3-resource-selector/s3-modal/__tests__/fetching.test.tsx

@@ -3,13 +3,15 @@
 import React from 'react';
 import { act, render, screen, waitFor } from '@testing-library/react';
 
+import { LiveRegionController } from '../../../../lib/components/internal/components/live-region/controller.js';
 import { S3Modal } from '../../../../lib/components/s3-resource-selector/s3-modal';
 import createWrapper, { ElementWrapper } from '../../../../lib/components/test-utils/dom';
 import { buckets, i18nStrings, objects, versions, waitForFetch } from '../../__tests__/fixtures';
 import { getElementsText, modalDefaultProps, navigateToTableItem } from './utils';
 
 import styles from '../../../../lib/components/s3-resource-selector/s3-modal/styles.css.js';
 
+LiveRegionController.defaultMinDelay = 0;
 jest.setTimeout(30_000);
 
 async function renderModal(jsx: React.ReactElement) {

src/table/__tests__/body-cell.test.tsx

@@ -3,6 +3,7 @@
 import * as React from 'react';
 import { fireEvent, render, screen, waitFor } from '@testing-library/react';
 
+import { LiveRegionController } from '../../../lib/components/internal/components/live-region/controller.js';
 import { TableBodyCell, TableBodyCellProps } from '../../../lib/components/table/body-cell';
 import { useStickyColumns } from '../../../lib/components/table/sticky-columns';
 import wrapper from '../../../lib/components/test-utils/dom';
@@ -18,6 +19,8 @@ const testItem = {
   test: 'testData',
 };
 
+LiveRegionController.defaultMinDelay = 0;
+
 const stickyCellRef = jest.fn();
 
 jest.mock('../../../lib/components/table/sticky-columns', () => ({