public function create(Dto $commentDto) : Dto
 {
     /** @var Comment $comment */
     $comment = $this->dtoToEntityMapper->transform($commentDto);
     $this->commentRepository->add($comment);
     $this->systemWideEventDispatcher->dispatch(new CommentHasBeenAdded($comment->getAuthorsUsername(), $comment->getPostId()));
     foreach ($comment->getMentions() as $mention) {
         $this->systemWideEventDispatcher->dispatch(new UserHasBeenMentioned($comment->getAuthorsUsername(), $mention->getUsername(), $comment->getPostId()));
     }
     return $this->entityToDtoMapper->transform($comment);
 }
 public function testCreate()
 {
     $this->dtoToEntityMapper->shouldReceive('transform')->once()->andReturn($this->comment);
     $this->commentRepository->shouldReceive('add')->once()->withArgs([$this->comment]);
     $this->eventDispatcher->shouldReceive('dispatch');
     $this->entityToDtoMapper->shouldReceive('transform')->once()->withArgs([$this->comment])->andReturn($this->commentDto);
     $this->mention->shouldReceive('getUsername')->andReturn('mentioned_user');
     $this->comment->shouldReceive('getAuthorsUsername')->andReturn('test');
     $this->comment->shouldReceive('getAuthorsAvatarFilename')->andReturn('test.jpg');
     $this->comment->shouldReceive('getPostId')->andReturn(123);
     $this->comment->shouldReceive('getMentions')->andReturn(new ArrayCollection([$this->mention]));
     $createdCommentDto = $this->createCommentHandler->create($this->commentDto);
     $this->assertInstanceOf(CommentDto::class, $createdCommentDto);
 }