public void Test_CreateIPortfolio_Simple()
{
// Dodaje se par portfelja i provjerava postoje li na burzi
string portfelj1 = "portfelj1";
_stockExchange.CreatePortfolio(portfelj1);
string portfelj2 = "portfelj2";
_stockExchange.CreatePortfolio(portfelj2);
Assert.True(_stockExchange.PortfolioExists(portfelj1));
Assert.True(_stockExchange.PortfolioExists(portfelj2));
Assert.AreEqual(2, _stockExchange.NumberOfPortfolios());
}