public void IsNew_ForNewInstance_ReturnsTrue()
        {
            var entity = new EntityWithIdOfGuid();

            Assert.AreEqual(Guid.Empty, entity.Id);
            Assert.IsTrue(entity.IsNew());
        }
        public void IsNew_WithNonDefaultValues_ReturnFalse()
        {
            var entity = new EntityWithIdOfGuid
            {
                Id = Guid.NewGuid()
            };

            Assert.IsFalse(entity.IsNew());
        }