public void S_xx_10_0()
{
//arrange
double expected = -333.333;
double a = 10;
double b = 0;
int n = 10000;
ICalculator calcul = new Simpson();
//act
double actual = calcul.Calculate(a, b, n, x => x * x);
//assert
Assert.AreEqual(expected, actual, 0.001);
}
public void S_Step_0()
{
//arrange
double expected = 0;
double a = 10;
double b = 10;
int n = 10000;
ICalculator calcul = new Simpson();
//act
double actual = calcul.Calculate(a, b, n, x => x * x);
//assert
Assert.AreEqual(expected, actual);
}
public void Simpson_Integrate_with_switched_variables()
{
//arrange
double expected = -333_333.3333;
double a = 100;
double b = 0;
long n = 100000;
Simpson simpson = new Simpson();
Func <double, double> f = x => x * x;
//act
double actual = simpson.Calculate(a, b, n, f);
//assert
Assert.AreEqual(expected, actual, 0.0001);
}
public void Simpson_Intergrate_xx_Gives_Correct_Result()
{
//arrange
double expected = 333_333.3333;
double a = 0;
double b = 100;
long n = 100000;
Simpson simpson = new Simpson();
Func <double, double> f = x => x * x;
//act
double actual = simpson.Calculate(a, b, n, f);
//assert
Assert.AreEqual(expected, actual, 0.0001);
}