public static void Test7()
        {
            //arrange
            CalculatingPremium p = new CalculatingPremium();

            //act
            float actualResult = p.CalcPremium(50, "rural");

            //assert
            Assert.That(actualResult, Is.EqualTo(0.75));
        }
        public static void Test3()
        {
            //arrange
            CalculatingPremium p = new CalculatingPremium();

            //act
            float actualResult = p.CalcPremium(10, "urban");

            //assert
            Assert.That(actualResult, Is.EqualTo(0));
        }