public void ItShouldReturnCryptos()
        {
            #region Act
            var response = _cryptoController.Get() as OkObjectResult;
            var cryptos  = response.Value as IEnumerable <Crypto>;
            #endregion

            #region Assert
            Assert.Equal(3, cryptos.Count());
            #endregion
        }
        public async void Test_Get_Crypto_Result()
        {
            var result = await _controller.Get(It.IsAny <Guid>());

            Assert.IsType <ActionResult <RestException> >(result);
        }