public void EarnStocks()
{
//Arrange
double beginningBal = 3500.00;
double transactionAmount = 2000.00;
Stocks sto = new Stocks();
//Act
sto.Buy(beginningBal);
sto.Earn(transactionAmount);
double actualBal = sto.GetShares;
// assert
Assert.AreEqual(actualBal, 5500.00);
}