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  package org.eclipse.jgit.revwalk;
  
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.fail;
  
  import org.eclipse.jgit.revwalk.filter.RevFilter;
  import org.eclipse.jgit.treewalk.filter.TreeFilter;
  import org.junit.Test;
  
  public class RevWalkMergeBaseTest extends RevWalkTestCase {
  	@Test
  	public void testNone() throws Exception {
  		final RevCommit c1 = commit(commit(commit()));
  		final RevCommit c2 = commit(commit(commit()));
  
  		rw.setRevFilter(RevFilter.MERGE_BASE);
  		markStart(c1);
  		markStart(c2);
  		assertNull(rw.next());
  	}
  
  	@Test
  	public void testDisallowTreeFilter() throws Exception {
  		final RevCommit c1 = commit();
  		final RevCommit c2 = commit();
  
  		rw.setRevFilter(RevFilter.MERGE_BASE);
  		rw.setTreeFilter(TreeFilter.ANY_DIFF);
  		markStart(c1);
  		markStart(c2);
  		try {
  			assertNull(rw.next());
  			fail("did not throw IllegalStateException");
  		} catch (IllegalStateException ise) {
  			// expected result
  		}
  	}
  
  	@Test
  	public void testSimple() throws Exception {
  		final RevCommit a = commit();
  		final RevCommit b = commit(a);
  		final RevCommit c1 = commit(commit(commit(commit(commit(b)))));
  		final RevCommit c2 = commit(commit(commit(commit(commit(b)))));
  
  		rw.setRevFilter(RevFilter.MERGE_BASE);
  		markStart(c1);
  		markStart(c2);
  		assertCommit(b, rw.next());
  		assertNull(rw.next());
  	}
  
  	@Test
  	public void testMultipleHeads_SameBase1() throws Exception {
  		final RevCommit a = commit();
  		final RevCommit b = commit(a);
 		final RevCommit c1 = commit(commit(commit(commit(commit(b)))));
 		final RevCommit c2 = commit(commit(commit(commit(commit(b)))));
 		final RevCommit c3 = commit(commit(commit(b)));
 
 		rw.setRevFilter(RevFilter.MERGE_BASE);
 		markStart(c1);
 		markStart(c2);
 		markStart(c3);
 		assertCommit(b, rw.next());
 		assertNull(rw.next());
 	}
 
 	@Test
 	public void testMultipleHeads_SameBase2() throws Exception {
 		final RevCommit a = commit();
 		final RevCommit b = commit(a);
 		final RevCommit c = commit(b);
 		final RevCommit d1 = commit(commit(commit(commit(commit(b)))));
 		final RevCommit d2 = commit(commit(commit(commit(commit(c)))));
 		final RevCommit d3 = commit(commit(commit(c)));
 
 		rw.setRevFilter(RevFilter.MERGE_BASE);
 		markStart(d1);
 		markStart(d2);
 		markStart(d3);
 		assertCommit(b, rw.next());
 		assertNull(rw.next());
 	}
 
 	@Test
 	public void testCrissCross() throws Exception {
 		// See http://marc.info/?l=git&m=111463358500362&w=2 for a nice
 		// description of what this test is creating. We don't have a
 		// clean merge base for d,e as they each merged the parents b,c
 		// in different orders.
 		//
 		final RevCommit a = commit();
 		final RevCommit b = commit(a);
 		final RevCommit c = commit(a);
 		final RevCommit d = commit(b, c);
 		final RevCommit e = commit(c, b);
 
 		rw.setRevFilter(RevFilter.MERGE_BASE);
 		markStart(d);
 		markStart(e);
 		assertCommit(c, rw.next());
 		assertCommit(b, rw.next());
 		assertNull(rw.next());
 	}
 }