Remount all removable storage devices upon policy update

chrome/browser/chromeos/file_manager/volume_manager_unittest.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/chromeos/file_manager/volume_manager.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <vector>
@@ skipping 769 matching lines @@
     if (secondary_observer.events()[i].type ==
         LoggingObserver::Event::VOLUME_MOUNTED)
       has_volume_mounted = true;
   }
   EXPECT_FALSE(has_volume_mounted);
 
   volume_manager()->RemoveObserver(&main_observer);
   secondary.volume_manager()->RemoveObserver(&secondary_observer);
 }
 
+TEST_F(VolumeManagerTest, OnExternalStorageReadOnlyChanged) {
+  // Emulate updates of kExternalStorageReadOnly (change to true, then false).
+  profile()->GetPrefs()->SetBoolean(prefs::kExternalStorageReadOnly, true);
+  volume_manager()->OnExternalStorageReadOnlyChanged();
+  profile()->GetPrefs()->SetBoolean(prefs::kExternalStorageReadOnly, false);
+  volume_manager()->OnExternalStorageReadOnlyChanged();
+
+  // Verify that remount of removable disks is triggered for each update.
+  ASSERT_EQ(2U, disk_mount_manager_->remount_all_requests().size());
+  const FakeDiskMountManager::RemountAllRequest& remount_request1 =
+      disk_mount_manager_->remount_all_requests()[0];
+  EXPECT_EQ(chromeos::MOUNT_ACCESS_MODE_READ_ONLY,
+            remount_request1.access_mode);
+  const FakeDiskMountManager::RemountAllRequest& remount_request2 =
+      disk_mount_manager_->remount_all_requests()[1];
+  EXPECT_EQ(chromeos::MOUNT_ACCESS_MODE_READ_WRITE,
+            remount_request2.access_mode);
+}
+
 TEST_F(VolumeManagerTest, GetVolumeList) {
   volume_manager()->Initialize();  // Adds "Downloads"
   std::vector<base::WeakPtr<Volume>> volume_list =
       volume_manager()->GetVolumeList();
   ASSERT_EQ(1u, volume_list.size());
   EXPECT_EQ("downloads:Downloads", volume_list[0]->volume_id());
   EXPECT_EQ(VOLUME_TYPE_DOWNLOADS_DIRECTORY, volume_list[0]->type());
 }
 
 TEST_F(VolumeManagerTest, FindVolumeById) {
@@ skipping 104 matching lines @@
   // Detach
   volume_manager()->OnRemovableStorageDetached(info);
   ASSERT_EQ(2u, observer.events().size());
   EXPECT_EQ(LoggingObserver::Event::VOLUME_UNMOUNTED,
             observer.events()[1].type);
 
   EXPECT_FALSE(volume.get());
 }
 
 }  // namespace file_manager