Angabe zu Unit Testing

public interface ICalc { double Add(double a, double b); double Sub(double a, double b); double Mul(double a, double b); double Div(double a, double b); } public class CalculatorUnitTesting : ICalc { public double Add(double a, double b) { return a + b; } public double Sub(double a, double b) { return a - b; } public double Mul(double a, double b) { return a * b; } public double Div(double a, double b) { return a / b; } }