public void When_file_unlocked_then_lock_owner_is_null_and_proper_event_published()
        {
            // Arrange
            FakeFileLockingService fileLockingService = new FakeFileLockingService();
            FakeFileRepository     fileRepository     = new FakeFileRepository();
            FakeEventPublisher     eventPublisher     = new FakeEventPublisher();
            FakeCurrentUser        currentUser        = new FakeCurrentUser();

            File file = new ExampleFileFactory().CreateFile();

            fileRepository.Save(file);
            currentUser.Id = "currentUserId";
            fileLockingService.Lock(file, new User(currentUser.Id, currentUser.Username));

            var commandHandler = new RemoveFileLockCommandHandler(
                fileLockingService, fileRepository, currentUser, eventPublisher);

            var command = new RemoveFileLockCommand("fileId");

            // Act
            commandHandler.Handle(command);

            // Assert
            Assert.IsFalse(fileLockingService.IsLocked(file));
            Assert.IsNull(fileLockingService.GetLockOwner(file));

            var publishedEvent = eventPublisher.VerifyPublishedOnce <FileLockChangedMessage>();

            Assert.IsFalse(publishedEvent.NewLock.IsLockPresent);
        }
        public void File_cannot_be_unlocked_by_user_other_than_lock_owner()
        {
            // Arrange
            FakeFileLockingService fileLockingService = new FakeFileLockingService();
            FakeFileRepository     fileRepository     = new FakeFileRepository();
            FakeEventPublisher     eventPublisher     = new FakeEventPublisher();
            FakeCurrentUser        currentUser        = new FakeCurrentUser();

            File file = new ExampleFileFactory().CreateFile();

            fileRepository.Save(file);
            currentUser.Id = "currentUserId";
            fileLockingService.Lock(file, new User("someRandomUserId", "someRandomUser"));

            var commandHandler = new RemoveFileLockCommandHandler(
                fileLockingService, fileRepository, currentUser, eventPublisher);

            var command = new RemoveFileLockCommand("fileId");

            // Act
            Assert.Throws <PermissionException>(() => commandHandler.Handle(command));
        }