public void TestSum()
        {
            var sut = new Summarizer();
            int actualSum = sut.CalculateSum(12, 30);
            Assert.AreEqual(42, actualSum);

            actualSum = sut.CalculateSum(52, -10);
            Assert.AreEqual(42, actualSum);

            actualSum = sut.CalculateSum(42, 0);
            Assert.AreEqual(42, actualSum);
        }
 public void PositiveZeroSummationSucceeds()
 {
     var sut = new Summarizer();
     int actualSum = sut.CalculateSum(42, 0);
     Assert.AreEqual(42, actualSum);
 }