public void GetPackageIdentifierTest()
{
int s = 3, e = 15;
int totalElements = 13;
var mul = new Multiplier();
var result = mul.GetPackageIdentifier(s, e);
Assert.AreEqual(totalElements, result.Count);
string lastIdentifier;
result.TryGetValue(e, out lastIdentifier);
Assert.AreEqual(Constants.returnDelivery, lastIdentifier);
}