public void DeleteCommentAndItsRepliesShouldReturnTrue() { var options = new DbContextOptionsBuilder <ApplicationDbContext>() .UseInMemoryDatabase(databaseName: "DeleteCommentAndItsReplies_Comments_Roads_Database") .Options; var dbContext = new ApplicationDbContext(options); var roadsService = new RoadsService(dbContext, null, null, null, null, null); var commentsService = new CommentsService(roadsService, dbContext); var user = new User { UserName = "******" }; var comment = new Comment { Content = "comment1", Id = "commentId1", Replies = new List <Reply> { new Reply { Id = "replyId1", } }, User = user }; dbContext.Users.Add(user); dbContext.Comments.Add(comment); dbContext.SaveChanges(); var result = commentsService.DeleteCommentAndItsReplies(comment.Id); Assert.True(result); Assert.True(comment.IsDeleted); }