c4.setCommitter(new PersonIdent(committer, 1154236443000L, -4 * 60));
c4.setMessage("A Commit 4\n");
c4.setTree(t);
assertEquals(t.getTreeId(), c3.getTreeId());
c4.setParentIds(new ObjectId[] { c1.getCommitId(), c2.getCommitId(), c3.getCommitId() });
c4.commit();
final ObjectId cmtid4 = ObjectId.fromString(
"d1fca9fe3fef54e5212eb67902c8ed3e79736e27");
assertEquals(cmtid4, c4.getCommitId());
Commit rm4 = db.mapCommit(cmtid4);