public void StandardBankAccount_Over10000_GetsDoubleInterest()
{
var bankAccount = new StandardBankAccount
{
Balance = 15000,
InterestRate = 0.015M
};
var interest = CalculateInterest(bankAccount);
interest.Should().Be(450M);
}
public void StandardBankAccount_Under10000_GetsNormalInterest()
{
var bankAccount = new StandardBankAccount
{
Balance = 5000,
InterestRate = 0.015M
};
var interest = CalculateInterest(bankAccount);
interest.Should().Be(75M);
}
private static decimal CalculateInterest(StandardBankAccount ba)
{
switch (ba)
{
case DodgyBankAccount dba:
return((dba.Balance * dba.InterestRate) + dba.BrownPaperBag);
case SuperDuperBankAccount sdba:
return(sdba.Balance * (sdba.BonusInterestRate + sdba.InterestRate));
case StandardBankAccount sba when sba.Balance <= 10000:
return(sba.Balance * sba.InterestRate);
case StandardBankAccount sba:
return(sba.Balance * (sba.InterestRate * 2));
default:
throw new ArgumentOutOfRangeException();
}
}
