Add an accessibility audit test for WebUI pages

chrome/test/data/webui/a11y_audit_browsertest.js

+// Copyright (c) 2012 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.
+
+function WebUIA11yAuditBrowserTest() {}
+
+WebUIA11yAuditBrowserTest.prototype = {
+  __proto__: testing.Test.prototype,
+
+  browsePreload: 'chrome://terms',
+
+  runA11yChecks: true,
+  a11yIssuesAreErrors: true,
+};
+
+function addAuditFailures() {
+  var style = document.createElement('style');
+  style.innerText = 'p { color: #ffffff }';
+  document.head.appendChild(style);
+}
+
+function expectAuditWillNotRun() {
+  axs.AuditRule.prototype.run = function() {
+    assertTrue(false, 'AuditRule.run should not be executed');
+  };
+}
+
+RUNTIME_TEST_F('WebUIA11yAuditBrowserTest', 'testWithAuditFailures', function() {
+  addAuditFailures();
+});
+
+RUNTIME_TEST_F('WebUIA11yAuditBrowserTest',
+               'testWithAuditFailures_a11yChecksDisabled',
+               function() {
+  expectAuditWillNotRun();
+  disableA11yChecks();
+  a11yIssuesAreErrors(false);
+  addAuditFailures();
+});
+
+function WebUIA11yAuditBrowserTest_TestsDisabledInFixture() {}
+
+WebUIA11yAuditBrowserTest_TestsDisabledInFixture.prototype = {
+  __proto__: WebUIA11yAuditBrowserTest.prototype,
+
+  runA11yChecks: false,
+};
+
+RUNTIME_TEST_F('WebUIA11yAuditBrowserTest_TestsDisabledInFixture',
+               'testWithAuditFailures',
+               function() {
+  enableA11yChecks();
+  addAuditFailures();
+});
+
+RUNTIME_TEST_F('WebUIA11yAuditBrowserTest_TestsDisabledInFixture',
+               'testWithAuditFailures_a11yChecksNotEnabled',
+               function() {
+  expectAuditWillNotRun();
+  addAuditFailures();
+});
+
+function WebUIA11yAuditBrowserTest_IssuesAreWarnings() {}
+
+WebUIA11yAuditBrowserTest_IssuesAreWarnings.prototype = {
+  __proto__: WebUIA11yAuditBrowserTest.prototype,
+
+  runA11yChecks: false,
+};
+
+RUNTIME_TEST_F('WebUIA11yAuditBrowserTest_IssuesAreWarnings',
+               'testWithAuditFailures',
+               function() {
+  enableA11yChecks();
+  addAuditFailures();
+});