public void GivenPrincipal10ExpectAbount10()
{
double P = 0.0;
CompoundInterest ci = new CompoundInterest();
double actual = ci.getAmount(P, 1, 1, 1);
double expected = 0;
Assert.Equal(expected, actual);
}
public void GivenNegativePrincipalThrowException()
{
double P = -1.0;
CompoundInterest ci = new CompoundInterest();
Exception ex = Assert.Throws <Exception>(
() => ci.getAmount(P, 1, 1, 1)
);
string actual = ex.Message;
string expected = "The principal cannot be negative number.";
Assert.Equal(expected, actual);
}
public void GivenParametersExpectAmount()
{
double P = 5000;
double r = 0.05;
double n = 12.0;
double t = 10.0;
CompoundInterest ci = new CompoundInterest();
double actual = Math.Round(ci.getAmount(P, r, n, t), 1);// round to 2 decimal places
double expected = 8235.0;
Assert.Equal(expected, actual);
}
public void GivenNagativeYearThrowException()
{
double t = -1.0;
CompoundInterest ci = new CompoundInterest();
Exception ex = Assert.Throws <Exception>(
() => ci.getAmount(1, 1, 1, t)
);
string actual = ex.Message;
string expected = "The number of year cannot be negative number.";
Assert.Equal(expected, actual);
}
public void GivenDivideNBy0ThrowException()
{
double n = 0.0;
CompoundInterest ci = new CompoundInterest();
Exception ex = Assert.Throws <Exception>(
() => ci.getAmount(1, 1, n, 1)
);
string actual = ex.Message;
string expected = "The number of times cannot divide by 0 time.";
Assert.Equal(expected, actual);
}