final DirCache treeP = db.readDirCache();
final DirCache treeT = db.readDirCache();
{
final DirCacheBuilder b = treeB.builder();
final DirCacheBuilder p = treeP.builder();
final DirCacheBuilder t = treeT.builder();
b.add(createEntry("a", FileMode.REGULAR_FILE));
p.add(createEntry("a", FileMode.REGULAR_FILE, "q"));
p.add(createEntry("p-fail", FileMode.REGULAR_FILE));