public void CalculatPriceEarningsRatioForComonStockTest()
{
var stockCommon = new CommonStock {
symbol = "TEA", lastDividend = 10, parValue = 100
};
var currentPeRatio = exchangeStock.CalculatePriceEarningsRatio(stockCommon, 100);
var expectedPeRatio = 1000;
Assert.AreEqual(expectedPeRatio, currentPeRatio);
}