MD Bookmarks: Implement item selection in new data flow system

chrome/test/data/webui/md_bookmarks/reducers_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('selection state', function() {
+  var initialState;
+
+  function select(items, anchor, add) {
+    return {
+      name: 'select-items',
+      add: add,
+      anchor: anchor,
+      items: items,
+    };
+  }
+
+  setup(function() {
+    initialState = {
+      anchor: null,
+      count: 0,
+      items: 1,

[calamity, 2017/03/14 03:01:45]

This is supposed to be an Object.

[tsergeant, 2017/03/14 05:42:02]

Done.

+    };
+  });
+
+  test('can select an item', function() {
+    var nextState;
+    var action;
+
+    action = select(['1'], '1', false);
+    nextState = bookmarks.SelectionState.updateSelection(initialState, action);

[calamity, 2017/03/14 03:01:45]

nextState => state as in previous patch.

[tsergeant, 2017/03/14 05:42:02]

Done.

+
+    assertDeepEquals({'1': true}, nextState.items);
+    assertEquals('1', nextState.anchor);
+
+    // Replace current selection.
+    action = select(['2'], '2', false);
+    nextState = bookmarks.SelectionState.updateSelection(nextState, action);
+    assertDeepEquals({'2': true}, nextState.items);
+    assertEquals('2', nextState.anchor);
+
+    // Add to current selection.
+    action = select(['3'], '3', true);
+    nextState = bookmarks.SelectionState.updateSelection(nextState, action);
+    assertDeepEquals({'2': true, '3': true}, nextState.items);
+    assertEquals('3', nextState.anchor);
+  });
+
+  test('can select multiple items', function() {
+    var nextState;
+    var action;
+
+    action = select(['1', '2', '3'], '3', false);
+    nextState = bookmarks.SelectionState.updateSelection(initialState, action);
+    assertDeepEquals({'1': true, '2': true, '3': true}, nextState.items);
+
+    action = select(['3', '4'], '4', true);
+    nextState = bookmarks.SelectionState.updateSelection(nextState, action);
+    assertDeepEquals(
+        {'1': true, '2': true, '3': true, '4': true}, nextState.items);
+  });
+
+  test('is cleared when selected folder changes', function() {
+    var nextState;
+    var action;
+
+    action = select(['1', '2', '3'], '3', false);
+    nextState = bookmarks.SelectionState.updateSelection(initialState, action);
+
+    action = bookmarks.actions.selectFolder('2');
+    nextState = bookmarks.SelectionState.updateSelection(nextState, action);
+    assertDeepEquals({}, nextState.items);
+  });
+
+  test('is cleared when search finished', function() {
+    var nextState;
+    var action;
+
+    action = select(['1', '2', '3'], '3', false);
+    nextState = bookmarks.SelectionState.updateSelection(initialState, action);
+
+    action = bookmarks.actions.setSearchResults(['2']);
+    nextState = bookmarks.SelectionState.updateSelection(nextState, action);
+    assertDeepEquals({}, nextState.items);
+  });
+});
+
 suite('closed folder state', function() {
   var nodes;
   var initialState;
 
   setup(function() {
     nodes = testTree(createFolder('0', [
       createFolder('1', []),
     ]));
     initialState = {};
   });
@@ skipping 163 matching lines @@
     // Case 2: Clear search by selecting a new folder.
     action = bookmarks.actions.selectFolder('0');
     var selectedState = bookmarks.reduceAction(searchedState, action);
 
     assertEquals('0', selectedState.selectedFolder);
     assertDeepEquals(['1'], bookmarks.util.getDisplayedList(selectedState));
     assertEquals('', selectedState.search.term);
     assertDeepEquals([], selectedState.search.results);
   });
 });