public async Task AddFundToPortfolioAsync_ReturnsOk()
        {
            var okResult = await portfolioController.AddFundToPortfolioAsync(new FundInfo());

            Assert.IsInstanceOf <OkObjectResult>(okResult.Result);
            var  actualValue   = (OkObjectResult)okResult.Result;
            bool expectedValue = true;

            expectedValue.Should().Equals(actualValue);
        }