public void DeletExceptionTest()
{
ICalculator delet = new DeletCalculator();
Assert.Throws<ArgumentException>(() => delet.Calculate(2, 0));
}
public void DeleteTests(double first, double two, double expected)
{
ICalculator delet = new DeletCalculator();
double result = delet.Calculate(first, two);
Assert.AreEqual(expected, result);
}