public void DeleteEquityTest()
{
var service = new StocksService();
var stock = new Equity()
{
Price = 50000,
Quantity = 3
};
var newStockId = service.AddStock(stock);
var newStock = service.GetStock(newStockId);
Assert.IsNotNull(newStock);
service.DeleteStock(newStock.Id);
newStock = service.GetStock(newStockId);
Assert.IsNull(newStock);
}