MD History: Delete button in the toolbar allows deletion of multiple history-items.

chrome/test/data/webui/md_history/history_supervised_user_test.js

Index: chrome/test/data/webui/md_history/history_supervised_user_test.js
diff --git a/chrome/test/data/webui/md_history/history_supervised_user_test.js b/chrome/test/data/webui/md_history/history_supervised_user_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..702229de26a6a071332a5ad3f3830acd46977450
--- /dev/null
+++ b/chrome/test/data/webui/md_history/history_supervised_user_test.js
@@ -0,0 +1,56 @@
+// 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('md_history.history_supervised_user_test', function() {
+  // Array of test history data.
+  var TEST_HISTORY_RESULTS = [
+    {
+      "dateRelativeDay": "Today - Wednesday, December 9, 2015",
+      "url": "https://www.google.com"
+    }
+  ];
+
+  function registerTests() {
+    suite('history-card-manager', function() {

[tsergeant, 2016/01/25 01:43:15]

Suite name should reflect that these are supervised-user specific tests

[hsampson, 2016/01/25 04:15:42]

Done.

+      var element;
+
+      suiteSetup(function() {
+        element = $('history-card-manager');
+      });
+
+      test('display for supervised user', function() {

[tsergeant, 2016/01/25 01:43:15]

The actual *test* here is whether the checkboxes are selectable. The test name
should reflect that.

[hsampson, 2016/01/25 04:15:42]

Done.

+        element.addNewResults(TEST_HISTORY_RESULTS);
+        var toolbar = $('toolbar');
+
+        flush(function() {
+          var card = Polymer.dom(element.root).querySelectorAll('history-card');
+          var item = Polymer.dom(card[0].root).querySelectorAll('history-item');
+
+          MockInteractions.tap(item[0].$['checkbox']);
+
+          assertFalse(item[0].selected);
+        });
+      });
+
+      test('deletion for supervised user', function() {
+        element.addNewResults(TEST_HISTORY_RESULTS);
+
+        // Make sure that removeVisits is not being called.
+        registerMessageCallback('removeVisits', this, function (toBeRemoved) {
+          assertEquals(toBeRemoved, []);

[tsergeant, 2016/01/25 01:43:15]

If you want to make sure something is never called, you can do

assertTrue(false)

That way, if the line of code is ever touched, it is guaranteed to error.

[hsampson, 2016/01/25 04:15:42]

Done.

+        });
+
+        element.historyDataByDay_[0].historyItems[0].selected = true;
+        $('toolbar').deleteSelection();
+      });
+
+      teardown(function() {
+        element.historyDataByDay_ = [];
+      });
+    });
+  }
+  return {
+    registerTests: registerTests
+  };
+});