fix: Fix failing tests.

This adds the missing div needed for ARIA 'announcements'.

Author: BenHenning

test/webdriverio/index.ts

@@ -9,6 +9,7 @@ import * as Blockly from 'blockly';
 import 'blockly/blocks';
 import {installAllBlocks as installColourBlocks} from '@blockly/field-colour';
 import {KeyboardNavigation} from '../../src/index';
+import * as aria from '../../src/screenreader/aria';
 import {registerFlyoutCursor} from '../../src/flyout_cursor';
 import {registerNavigationDeferringToolbox} from '../../src/navigation_deferring_toolbox';
 // @ts-expect-error No types in js file
@@ -86,6 +87,15 @@ function createWorkspace(): Blockly.WorkspaceSvg {
   registerNavigationDeferringToolbox();
   const workspace = Blockly.inject(blocklyDiv, injectOptions);
 
+  const injectionDiv = document.querySelector('.injectionDiv');
+  if (!injectionDiv) {
+    throw new Error('Expected injection div to exist after injection.');
+  }
+  const ariaAnnouncementSpan = document.createElement('span');
+  ariaAnnouncementSpan.id = 'blocklyAriaAnnounce';
+  aria.setState(ariaAnnouncementSpan, aria.State.LIVE, 'polite');
+  injectionDiv.appendChild(ariaAnnouncementSpan);
+
   Blockly.ContextMenuItems.registerCommentOptions();
   new KeyboardNavigation(workspace);