chrome/browser/resources/chromeos/accessibility/switch_access/test_support.js

// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * Test support.
 */
const focusRingState = {
  'primary': {'role': '', 'name': ''},
  'preview': {'role': '', 'name': ''}
};
let expectedType = '';
let expectedRole = '';
let expectedName = '';
let successCallback = null;
const transcript = [];

function checkFocusRingState() {
  if (expectedType !== '' &&
      focusRingState[expectedType].role === expectedRole &&
      focusRingState[expectedType].name === expectedName) {
    if (successCallback) {
      transcript.push(
          `Success type=${expectedType} ` +
          `role=${expectedRole} name=${expectedName}`);
      successCallback();
      successCallback = null;
    }
  }
}

function waitForFocusRing(type, role, name, callback) {
  transcript.push(`Waiting for type=${type} role=${role} name=${name}`);
  expectedType = type;
  expectedRole = role;
  expectedName = name;
  successCallback = callback;
  checkFocusRingState();
}

FocusRingManager.setObserver((primary, preview) => {
  if (primary && primary instanceof BackButtonNode) {
    focusRingState['primary']['role'] = 'back';
    focusRingState['primary']['name'] = '';
  } else if (primary && primary.automationNode) {
    const node = primary.automationNode;
    focusRingState['primary']['role'] = node.role;
    focusRingState['primary']['name'] = node.name;
  } else {
    focusRingState['primary']['role'] = '';
    focusRingState['primary']['name'] = '';
  }
  if (preview && preview.automationNode) {
    const node = preview.automationNode;
    focusRingState['preview']['role'] = node.role;
    focusRingState['preview']['name'] = node.name;
  } else {
    focusRingState['preview']['role'] = '';
    focusRingState['preview']['name'] = '';
  }
  transcript.push(`Focus ring state: ${JSON.stringify(focusRingState)}`);
  checkFocusRingState();
});
window.domAutomationController.send('ready');

setInterval(() => {
  console.error(
      'Test still running. Transcript so far:\n' + transcript.join('\n'));
}, 5000);