public void Add_BeginningOfListItemNotAlreadyInList_IndicesCorrect()
{
var people = new List <Person>()
{
new Person()
};
_source.Insert(0, people[0]);
_target.Add(0, people);
Assert.AreEqual(1, _target[people[0]].Count());
Assert.AreEqual(3, _target[_first].Count());
Assert.AreEqual(1, _target[_second].Count());
Assert.AreEqual(2, _target[_third].Count());
int index = 0;
Assert.IsTrue(_target[people[0]].Contains(index++));
Assert.IsTrue(_target[_first].Contains(index++));
Assert.IsTrue(_target[_first].Contains(index++));
Assert.IsTrue(_target[_first].Contains(index++));
Assert.IsTrue(_target[_second].Contains(index++));
Assert.IsTrue(_target[_third].Contains(index++));
Assert.IsTrue(_target[_third].Contains(index++));
}
