public void TestGeneratesUuid()
        {
            var uuid  = new UuIdService();
            var token = uuid.GenerateUuId();

            Assert.NotNull(token);
            Assert.True(token.Length > 0);
        }
        public void TestUuIdsAreUnique()
        {
            var tokens = new HashSet <string>();
            var uuid   = new UuIdService();

            for (var i = 0; i < 100; i++)
            {
                tokens.Add(uuid.GenerateUuId());
            }

            Assert.Equal(100, tokens.Count);
        }