public void AddBranchOnlyOnce()
        {
            Distribution myDistribution = new Distribution();
            Branch       myBranch       = new Branch();

            myDistribution.AddBranch(myBranch);
            myDistribution.AddBranch(myBranch);
            Assert.IsTrue(myDistribution.Branches.Contains(myBranch));
            Assert.AreEqual(1, myDistribution.Branches.Count);
        }