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); }