DirCache index = db.lockDirCache();
DirCacheEditor editor = index.editor();
editor.add(add(db, trash, "file1"));
editor.add(add(db, trash, "dir/subfile"));
editor.commit();
FileTreeIterator iterator = new FileTreeIterator(db);
IndexDiff diff = new IndexDiff(db, tree.getId(), iterator);
diff.diff();
assertEquals(2, diff.getAdded().size());
assertTrue(diff.getAdded().contains("file1"));