public void Exporters_XrefExporter_moveDocPos()
{
var docs = GetDocs();
Document first = docs[0];
Document last = docs[1];
TestExporter exporter = new TestExporter();
exporter.SetDocs(docs);
Assert.AreEqual(last, exporter.getNextDoc(0));
Assert.AreEqual(first, exporter.getPreviousDoc(1));
Assert.AreEqual(null, exporter.getNextDoc(1));
Assert.AreEqual(null, exporter.getPreviousDoc(0));
}