MD Bookmarks: Implement item selection in new data flow system

chrome/test/data/webui/md_bookmarks/list_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.
 
 suite('<bookmarks-list>', function() {
   var list;
   var store;
 
   setup(function() {
     store = new bookmarks.TestStore({
@@ skipping 47 matching lines @@
     list.$.editBookmark.showModal();
     MockInteractions.tap(list.$.saveButton);
   });
 
   test('renders correct <bookmark-item> elements', function() {
     var items = list.root.querySelectorAll('bookmarks-item');
     var ids = Array.from(items).map((item) => item.itemId);
 
     assertDeepEquals(['1', '3', '5', '7'], ids);
   });
+
+  test('selects individual items', function() {
+    var items = list.root.querySelectorAll('bookmarks-item');
+
+    customClick(items[0]);
+    var expected = {
+      name: 'select-items',
+      add: false,
+      anchor: '1',
+      items: ['1'],
+    };
+    assertDeepEquals(expected, store.lastAction);
+
+    customClick(items[2], {ctrlKey: true});
+    expected.add = true;
+    expected.anchor = '5';
+    expected.items = ['5'];
+    assertDeepEquals(expected, store.lastAction);
+  });
+
+  test('shift-selects multiple items', function() {
+    var items = list.root.querySelectorAll('bookmarks-item');
+    store.data.selection.anchor = '1';
+
+    customClick(items[2], {shiftKey: true});
+
+    assertEquals('select-items', store.lastAction.name);
+    assertFalse(store.lastAction.add);
+    assertEquals('5', store.lastAction.anchor);
+    assertDeepEquals(['1', '3', '5'], store.lastAction.items);
+  });
+
+  test('selects the item when the anchor is missing', function() {
+    var items = list.root.querySelectorAll('bookmarks-item');
+    // Anchor hasn't been set yet:
+    store.data.selection.anchor = null;
+
+    customClick(items[0], {shiftKey: true});
+    assertEquals('1', store.lastAction.anchor);
+    assertDeepEquals(['1'], store.lastAction.items);
+
+    // Anchor item doesn't exist:
+    store.data.selection.anchor = '42';
+
+    customClick(items[1], {shiftKey: true});
+
+    assertEquals('3', store.lastAction.anchor);
+    assertDeepEquals(['3'], store.lastAction.items);
+  });
 });