protected function applyTaskDescriptionWasChanged(TaskDescriptionWasChanged $event)
{
$task = $this->getTask($event->getTaskId());
$task->changeDescription($event->getNewDescription());
}
/** @test */
function it_can_cancel_pending_changes()
{
$taskListId = TaskListId::generate();
$domainEvents = new DomainEvents();
$pendingChanges = new DomainEvents();
$cancelledChange = new TaskDescriptionWasChanged($taskListId, TaskId::generate(), 'Learn more DDD!', 'Implement Event Sourcing');
$pendingChange = new TaskDescriptionWasChanged($taskListId, TaskId::generate(), 'Draw Boxes', 'Draw EVEN more boxes');
$domainEvents->push(new TaskWasAdded($taskListId, $cancelledChange->getTaskId(), 'Learn more DDD!'));
$domainEvents->push(new TaskWasAdded($taskListId, $pendingChange->getTaskId(), 'Draw Boxes'));
$pendingChanges->push($cancelledChange);
$pendingChanges->push($pendingChange);
$taskList = TaskList::reconstituteFrom($taskListId, $domainEvents, $pendingChanges);
$taskList->cancelPendingChange($cancelledChange->getKey());
$pendingChanges = $taskList->getPendingChanges();
$this->assertCount(1, $pendingChanges);
$this->assertTrue($pendingChanges->contains($pendingChange));
}