public void MultipleKeyEntityIndexContainsExistingEntities()
        {
            SetupMultipleKeyEntityIndex();

            _index.Deactivate();
            _index.Activate();

            Assert.AreEqual(_entity1, _index.GetEntities("1").First());
            Assert.Contains(_entity1, _index.GetEntities("2").ToList());
            Assert.Contains(_entity2, _index.GetEntities("2").ToList());
            Assert.AreEqual(_entity2, _index.GetEntities("3").First());
        }