chore: Add a test for HTML toasts.

Author: gonfunko

test/webdriverio/test/toast_test.ts

@@ -0,0 +1,38 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import * as chai from 'chai';
+import * as Blockly from 'blockly/core';
+import {PAUSE_TIME, testFileLocations, testSetup} from './test_setup.js';
+
+suite('HTML toasts', function () {
+  setup(async function () {
+    this.browser = await testSetup(testFileLocations.BASE);
+    await this.browser.pause(PAUSE_TIME);
+  });
+
+  test('Can be displayed', async function () {
+    const equal = await this.browser.execute(() => {
+      const element = document.createElement('div');
+      element.id = 'testToast';
+      element.innerHTML = 'This is a <b>test</b>';
+
+      const options = {
+        element,
+        message: 'Placeholder',
+      };
+      Blockly.dialog.toast(
+        Blockly.getMainWorkspace() as Blockly.WorkspaceSvg,
+        options,
+      );
+
+      // Ensure that the element displayed in the toast is the one we specified.
+      return document.querySelector('.blocklyToast #testToast') === element;
+    });
+
+    chai.assert.isTrue(equal);
+  });
+});