public void TestSequenceMap()
{
var map = new SequenceMap();
Assert.AreEqual(0, map.GetCheckpointedSequence());
Assert.AreEqual(null, map.GetCheckpointedValue());
Assert.IsTrue(map.IsEmpty());
Assert.AreEqual(1, map.AddValue("one"));
Assert.AreEqual(0, map.GetCheckpointedSequence());
Assert.AreEqual(null, map.GetCheckpointedValue());
Assert.IsTrue(!map.IsEmpty());
Assert.AreEqual(2, map.AddValue("two"));
Assert.AreEqual(0, map.GetCheckpointedSequence());
Assert.AreEqual(null, map.GetCheckpointedValue());
Assert.AreEqual(3, map.AddValue("three"));
Assert.AreEqual(0, map.GetCheckpointedSequence());
Assert.AreEqual(null, map.GetCheckpointedValue());
map.RemoveSequence(2);
Assert.AreEqual(0, map.GetCheckpointedSequence());
Assert.AreEqual(null, map.GetCheckpointedValue());
map.RemoveSequence(1);
Assert.AreEqual(2, map.GetCheckpointedSequence());
Assert.AreEqual("two", map.GetCheckpointedValue());
Assert.AreEqual(4, map.AddValue("four"));
Assert.AreEqual(2, map.GetCheckpointedSequence());
Assert.AreEqual("two", map.GetCheckpointedValue());
map.RemoveSequence(3);
Assert.AreEqual(3, map.GetCheckpointedSequence());
Assert.AreEqual("three", map.GetCheckpointedValue());
map.RemoveSequence(4);
Assert.AreEqual(4, map.GetCheckpointedSequence());
Assert.AreEqual("four", map.GetCheckpointedValue());
Assert.IsTrue(map.IsEmpty());
}