public void TestCommonStockYield()
{
// Test Common Stock
CommonStock stock;
stock = new CommonStock("TST", 0, 100);
float yield;
// Test 0/50 => 0
yield = stock.GetDividendYield(50);
Assert.AreEqual(0, yield, float.Epsilon);
// Test 10/10 => 1
stock.LastDividend = 10;
yield = stock.GetDividendYield(10);
Assert.AreEqual(1, yield, float.Epsilon);
// Test 10/0 => NaN
yield = stock.GetDividendYield(0);
Assert.AreEqual(float.NaN, yield);
// LastPrice
stock = new CommonStock("TST", 0, 100);
// Test 0/50 => 0
stock.LastPrice = 50;
yield = stock.GetDividendYield();
Assert.AreEqual(0, yield, float.Epsilon);
// Test 10/10 => 1
stock.LastPrice = 10;
stock.LastDividend = 10;
yield = stock.GetDividendYield();
Assert.AreEqual(1, yield, float.Epsilon);
// Test 10/0 => NaN
stock.LastPrice = 0;
yield = stock.GetDividendYield();
Assert.AreEqual(float.NaN, yield);
}
public void TestCommonStockPERatio()
{
CommonStock stock;
stock = new CommonStock("TST", 10, 100);
float pe;
// Test 0/10 => 0
pe = stock.GetPERatio(0);
Assert.AreEqual(0, pe, float.Epsilon);
// Test 10/10 => 1
pe = stock.GetPERatio(10);
Assert.AreEqual(1, pe, float.Epsilon);
// Test 10/0 => NaN
stock.LastDividend = 0;
pe = stock.GetPERatio(10);
Assert.AreEqual(float.NaN, pe);
// LastPrice
stock = new CommonStock("TST", 10, 100);
// Test 0/10 => 0
stock.LastPrice = 0;
pe = stock.GetPERatio();
Assert.AreEqual(0, pe, float.Epsilon);
// Test 10/10 => 1
stock.LastPrice = 10;
pe = stock.GetPERatio();
Assert.AreEqual(1, pe, float.Epsilon);
// Test 10/0 => NaN
stock.LastPrice = 10;
stock.LastDividend = 0;
pe = stock.GetPERatio();
Assert.AreEqual(float.NaN, pe);
}
public void TestStockCollectionGeometricMean()
{
StockCollection stocks = new StockCollection();
GenericStock stock1 = new CommonStock("TS1", 5, 100);
GenericStock stock2 = new CommonStock("TS2", 10, 100);
GenericStock stock3 = new CommonStock("TS3", 15, 100);
stocks.Add(stock1);
stocks.Add(stock2);
stocks.Add(stock3);
float gm;
// If no any prices => no result
gm = stocks.GetGeometricMean();
Assert.AreEqual(float.NaN, gm);
float price1 = 110;
float price2 = 50;
float price3 = 10;
stock1.LastPrice = price1;
stock2.LastPrice = price2;
// If there is at least one stock w/o price => no result
gm = stocks.GetGeometricMean();
Assert.AreEqual(float.NaN, gm);
stock3.LastPrice = price3;
// result is the 3-sq of price1*price2*price3
gm = stocks.GetGeometricMean();
float mul = 1.0f;
mul *= price1;
mul *= price2;
mul *= price3;
float nsq = 1f / 3;
Assert.AreEqual(Math.Pow(mul, nsq), gm, 0.0001f);
}
