public void TestMinus2PowerMinus2_ShouldReturn0()
        {
            var power  = new NaturalPowerCalculator();
            var result = power.Calculate(-2, -2);

            Assert.AreEqual(0, result);
        }
        public void Test2Power0_ShouldReturn1()
        {
            var power  = new NaturalPowerCalculator();
            var result = power.Calculate(2, 1);

            Assert.AreEqual(2, result);
        }