public void ValidatesDeckIdTest()
        {
            using DbContext context = CreateContext();
            CardCommitValidator validator = new CardCommitValidator(context);
            Card card = new Card()
            {
                CardTemplateId = 1,
                CardId         = 1
            };

            card.Fields.Add(new CardField()
            {
                CardId    = 1,
                FieldName = "TestField",
                Value     = "test"
            });

            //not successful
            string error = validator.Validate(card);

            Assert.IsFalse(string.IsNullOrEmpty(error));

            //successful
            card.DeckId = 1;
            error       = validator.Validate(card);
            Assert.IsTrue(string.IsNullOrEmpty(error));
        }