MD Bookmarks: Pull context menu into separate element

chrome/test/data/webui/md_bookmarks/command_manager_test.js

+// Copyright 2017 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.
+
+suite('<bookmarks-command-manager>', function() {
+  var commandManager;
+  var store;
+
+  setup(function() {
+    store = new bookmarks.TestStore({
+      nodes: testTree(createFolder(
+          '1',
+          [
+            createFolder('11', []),
+            createFolder('12', []),
+            createItem('13'),
+          ])),
+    });
+    bookmarks.Store.instance_ = store;
+
+    commandManager = document.createElement('bookmarks-command-manager');
+    replaceBody(commandManager);
+  });
+
+  test('can only copy single URL items', function() {
+    assertFalse(commandManager.canExecute(Command.COPY, new Set(['11'])));
+    assertFalse(commandManager.canExecute(Command.COPY, new Set(['11', '13'])));
+    assertTrue(commandManager.canExecute(Command.COPY, new Set(['13'])));
+  });
+
+  test('context menu hides invalid commands', function() {
+    store.data.selection.items = new Set(['11', '13']);
+    store.notifyObservers();
+
+    commandManager.openCommandMenuAtPosition(0, 0);
+    var commandHidden = {};
+    commandManager.root.querySelectorAll('.dropdown-item').forEach(element => {
+      commandHidden[element.getAttribute('command')] = element.hidden;
+    });
+
+    // With a folder and an item selected, the only available context menu item
+    // is 'Delete'.
+    assertTrue(commandHidden['edit']);
+    assertTrue(commandHidden['copy']);
+    assertFalse(commandHidden['delete']);
+  });
+});