public void Test_Close_Exchange() { var wrongClose = _exchangeProvider.CloseExchange(1, ExchangeResultType.Failure); Assert.IsNull(wrongClose); _exchangeProvider.OpenExchange(1, 2); var goodClose = _exchangeProvider.CloseExchange(1, ExchangeResultType.Failure); Assert.IsTrue((goodClose != null) && (goodClose.Type == ExchangeResultType.Failure)); }