Blog.Logic.Core.Tests.TagsLogicTest.ShouldErrorWhenTagExistsOnAdd C# (CSharp) Method

        public void ShouldErrorWhenTagExistsOnAdd()
        {
            var tag = new Common.Contracts.Tag { TagName = "lorem" };
            var tags = _tags.Where(a => a.TagName == "lorem").ToList();

            _tagRepository = new Mock<ITagRepository>();
            _tagRepository.Setup(a => a.Add(It.IsAny<Tag>())).Returns(It.IsAny<Tag>);
            _tagRepository.Setup(a => a.Find(It.IsAny<Expression<Func<Tag, bool>>>(),
                It.IsAny<Func<IQueryable<Tag>, IOrderedQueryable<Tag>>>(), It.IsAny<string>()))
                .Returns(tags);

            _postRepository = new Mock<IPostRepository>();

            _tagsLogic = new TagsLogic(_tagRepository.Object, _postRepository.Object);

            var result = _tagsLogic.Add(tag);

            Assert.NotNull(result.Error);
            Assert.AreEqual((int)Constants.Error.ValidationError, result.Error.Id);
            Assert.AreEqual("Record already exists", result.Error.Message);
        }