int partsCountBefore = wordMLPackage.getParts().getParts().size();
// Add it again
// Note that we're adding this ELSEWHERE in the pkg for the purposes of this test only
HeaderPart part2 = new HeaderPart();
Relationship rel = wordMLPackage.addTargetPart(part2, mode);
if (mode==AddPartBehaviour.REUSE_EXISTING) {
// In the REUSE_EXISTING case, we won't be adding this part, so
// we can't add content to it (since its pkg isn't set)
part2 = (HeaderPart)wordMLPackage.getRelationshipsPart().getPart(rel);
}