[CI] Add a11y checks to our visual testing suite (#7047)

* Add a VISUAL_URL constant and remove all vestiges of hide inspector and tree

* hide timer and add concurrency

* turn off concurrency

* factor out old appAction

* Add expand button to panes

* remove old slow annotations

* fix fault

* update domcontentloaded

* missed refactor

* driveby: setTimeBounds private

* add comments to the percyCSS

* suggest MISSION_TIME

* more notes

* regen

* clean up test

* driveby: clean up order

* restructure

* add new suite now that i'ts hidden

* use mission time everywhere possible

* driveby

* rerun generatedata

* comments

* lint fix

* add inital pass of a11y tests

* first pass for fixing a11y problems

* update build

* add copyright

* check for slashes

* rename files

* update testcases

* update to latest

* updates

* section 508

* final version

* remove leftover

* comments

* documentation

* bad merge

* comment

* use current ruleset

* typo

* feedback

* remove time conductor due to false positives

* default to closed tabs

* add some more accessiblity checking

* change to a condition widget and update search

* lint fix

* turns this into a single function

* update doc to match single function

* update to single function

* update to new function

* lint

* update locator for search input

* fix extra page

* why

* comments

* comments

* refacotr

* wrong paths and fixes

e2e/tests/visual-a11y/components/about.visual.spec.js

@@ -0,0 +1,53 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2023, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+/*
+Tests the branding associated with the default deployment. At least the about modal for now
+*/
+
+const { test, expect } = require('../../../pluginFixtures');
+const percySnapshot = require('@percy/playwright');
+const VISUAL_URL = require('../../../constants').VISUAL_URL;
+
+test.describe('Visual - Branding', () => {
+  test.beforeEach(async ({ page }) => {
+    //Go to baseURL and Hide Tree
+    await page.goto(VISUAL_URL, { waitUntil: 'domcontentloaded' });
+  });
+
+  test('Visual - About Modal', async ({ page, theme }) => {
+    // Click About button
+    await page.click('.l-shell__app-logo');
+
+    // Modify the Build information in 'about' to be consistent run-over-run
+    const versionInformationLocator = page.locator('ul.t-info.l-info.s-info').first();
+    await expect(versionInformationLocator).toBeEnabled();
+    await versionInformationLocator.evaluate(
+      (node) =>
+        (node.innerHTML =
+          '<li>Version: visual-snapshot</li> <li>Build Date: Mon Nov 15 2021 08:07:51 GMT-0800 (Pacific Standard Time)</li> <li>Revision: 93049cdbc6c047697ca204893db9603b864b8c9f</li> <li>Branch: master</li>')
+    );
+
+    // Take a snapshot of the About modal
+    await percySnapshot(page, `About (theme: '${theme}')`);
+  });
+});