assertTrue(descr.getImports().contains(importDescr));
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutput out = new ObjectOutputStream(baos);
descr.writeExternal(out);
ObjectInput in = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()));
PackageDescr newDescr = new PackageDescr();
newDescr.readExternal(in);