public void Notify_Add_Trade_Method_Test()
{
tradesCollection = new TradesCollection();
tradesCollection.TradeAdded += UpdateLastTradeSymbol;
Trade trade = new Trade("SRT-021231", "RTS-6.19", new DateTime(2019, 01, 5), 125000, 5);
tradesCollection.Add(trade);
Assert.AreEqual(trade.Symbol, lastTradeSymbol);
}