public void FindReceiptInclude() { Receipt receipt = new Receipt { Book = new Book { Author = "Автор", Id = 1, Name = "Name" }, BookId = 1, Date = DateTime.Now, UserId = 1, DateReturn = DateTime.Now, Id = 1, User = new User { Birthday = DateTime.Now, Id = 1, Name = "Name" } }; _repository = new ReceiptRepository(new LibContext()); _repository.Create(receipt); // Act var result = _repository.FindReceiptInclude(receipt.Id); // Assert Assert.IsNotNull(result); }