csw = new CompoundFileDirectory(newDir, "d.cfs", newIOContext(random()), false);
assertEquals(2, csw.listAll().length);
nested = new CompoundFileDirectory(csw, "b.cfs", newIOContext(random()), false);
assertEquals(2, nested.listAll().length);
IndexInput openInput = nested.openInput("b.xyz", newIOContext(random()));
assertEquals(0, openInput.readInt());
openInput.close();
openInput = nested.openInput("b_1.xyz", newIOContext(random()));
assertEquals(1, openInput.readInt());