// ==================== Investments ==================== //

        //[TestMethod]
        public void Can_get_investment_holdings()
        {
            // Arrange
            var request = new Investments.GetInvestmentHoldingsRequest();

            request.UseDefaults();

            var sut = new PlaidClient(Environment.Sandbox);

            // Act
            var result = sut.FetchInvestmentHoldingsAsync(request).Result;

            // Assert
            result.ShouldNotBeNull();
            result.IsSuccessStatusCode.ShouldBeTrue();
            result.Holdings.ShouldNotBeNull();
        }