public async Task AddWalletTest()
        {
            // Arrange
            var repo        = new InMemoryRepository();
            var myNewWallet = new Wallet()
            {
                Id = Guid.NewGuid(), WalletName = "Test Wallet-" + Guid.NewGuid(), CreationDate = DateTime.Now
            };

            // Act
            var repoResult = await repo.CreateWallet(myNewWallet);

            // Assert
            Assert.NotNull(repoResult);
            Assert.IsType(typeof(Wallet), repoResult);
        }