@Test
public void test012_SubtreeExternalSorting() throws IOException {
final ObjectId emptyBlob = insertEmptyBlob();
final Tree t = new Tree(db);
final FileTreeEntry e0 = t.addFile("a-");
final FileTreeEntry e1 = t.addFile("a-b");
final FileTreeEntry e2 = t.addFile("a/b");
final FileTreeEntry e3 = t.addFile("a=");
final FileTreeEntry e4 = t.addFile("a=b");