MD Settings: Fix <select> search highlighting.

chrome/test/data/webui/settings/search_settings_test.js

+// Copyright 2016 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.
+
+cr.define('settings_test', function() {
+  var searchManager = settings.getSearchManager();
+
+  suite('SearchSettingsTest', function() {
+    setup(function() {
+      PolymerTest.clearBody();
+    });
+
+    /**
+     * Test that the DOM of a node is modified as expected when a search hit
+     * occurs within that node.
+     */
+    test('normal highlighting', function() {
+      var optionText = 'FooSettingsFoo';
+
+      document.body.innerHTML =
+          `<settings-section hidden-by-search>
+             <div id="mydiv">${optionText}</div>
+           </settings-section>`;
+
+      var section = document.querySelector('settings-section');
+      var div = document.querySelector('#mydiv');
+
+      assertTrue(section.hiddenBySearch);
+      return searchManager.search('settings', section).then(function() {
+        assertFalse(section.hiddenBySearch);
+
+        var highlightWrapper = div.querySelector('.search-highlight-wrapper');
+        assertTrue(!!highlightWrapper);
+
+        var originalContent = highlightWrapper.querySelector(
+            '.search-highlight-original-content');
+        assertTrue(!!originalContent);
+        assertEquals(optionText, originalContent.textContent);
+
+        var searchHits = highlightWrapper.querySelectorAll(
+            '.search-highlight-hit');
+        assertEquals(1, searchHits.length);
+        assertEquals('Settings', searchHits[0].textContent);
+
+        // Check that original DOM structure is restored when search
+        // highlights are cleared.
+        return searchManager.search('', section);
+      }).then(function() {
+        assertEquals(0, div.children.length);
+        assertEquals(optionText, div.textContent);
+      });
+    });
+
+    /**
+     * Tests that a search hit within a <select> node causes the parent
+     * settings-section to be shown, but the DOM of the <select> is not
+     * modified.
+     */
+    test('<select> highlighting', function() {
+      document.body.innerHTML =
+          `<settings-section hidden-by-search>
+             <select>
+               <option>Foo</option>
+               <option>Settings</option>
+               <option>Baz</option>
+             </select>
+           </settings-section>`;
+
+      var section = document.querySelector('settings-section');
+      var select = section.querySelector('select');
+
+      assertTrue(section.hiddenBySearch);
+      return searchManager.search('settings', section).then(function() {
+        assertFalse(section.hiddenBySearch);
+
+        var highlightWrapper = select.querySelector(
+            '.search-highlight-wrapper');
+        assertFalse(!!highlightWrapper);
+
+        // Check that original DOM structure is present even after search
+        // highlights are cleared.
+        return searchManager.search('', section);
+      }).then(function() {
+        var options = select.querySelectorAll('option');
+        assertEquals(3, options.length);
+        assertEquals('Foo', options[0].textContent);
+        assertEquals('Settings', options[1].textContent);
+        assertEquals('Baz', options[2].textContent);
+      });
+    });
+  });
+});