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  package org.eclipse.jgit.revwalk;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNull;
  
  import org.junit.Test;
  
  public class DateRevQueueTest extends RevQueueTestCase<DateRevQueue> {
  	protected DateRevQueue create() {
  		return new DateRevQueue();
  	}
  
  	@Test
  	public void testEmpty() throws Exception {
  		super.testEmpty();
  		assertNull(q.peek());
  		assertEquals(Generator.SORT_COMMIT_TIME_DESC, q.outputType());
  	}
  
  	@Test
  	public void testCloneEmpty() throws Exception {
  		q = new DateRevQueue(AbstractRevQueue.EMPTY_QUEUE);
  		assertNull(q.next());
  	}
  
  	@Test
  	public void testInsertOutOfOrder() throws Exception {
  		final RevCommit a = parseBody(commit());
  		final RevCommit b = parseBody(commit(10, a));
  		final RevCommit c1 = parseBody(commit(5, b));
  		final RevCommit c2 = parseBody(commit(-50, b));
  
  		q.add(c2);
  		q.add(a);
  		q.add(b);
  		q.add(c1);
  
  		assertCommit(c1, q.next());
  		assertCommit(b, q.next());
  		assertCommit(a, q.next());
  		assertCommit(c2, q.next());
  		assertNull(q.next());
  	}
  
  	@Test
  	public void testInsertTie() throws Exception {
  		final RevCommit a = parseBody(commit());
  		final RevCommit b = parseBody(commit(0, a));
  		{
  			q = create();
  			q.add(a);
  			q.add(b);
  
  			assertCommit(a, q.next());
  			assertCommit(b, q.next());
 			assertNull(q.next());
 		}
 		{
 			q = create();
 			q.add(b);
 			q.add(a);
 
 			assertCommit(b, q.next());
 			assertCommit(a, q.next());
 			assertNull(q.next());
 		}
 	}
 
 	@Test
 	public void testCloneFIFO() throws Exception {
 		final RevCommit a = parseBody(commit());
 		final RevCommit b = parseBody(commit(200, a));
 		final RevCommit c = parseBody(commit(200, b));
 
 		final FIFORevQueue src = new FIFORevQueue();
 		src.add(a);
 		src.add(b);
 		src.add(c);
 
 		q = new DateRevQueue(src);
 		assertFalse(q.everbodyHasFlag(RevWalk.UNINTERESTING));
 		assertFalse(q.anybodyHasFlag(RevWalk.UNINTERESTING));
 		assertCommit(c, q.peek());
 		assertCommit(c, q.peek());
 
 		assertCommit(c, q.next());
 		assertCommit(b, q.next());
 		assertCommit(a, q.next());
 		assertNull(q.next());
 	}
 }