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);
 }