aUnionFeature.selectionList("base_objects").append(anExtrusionResult.subResult(2), None);
aSession.finishOperation()
assert (len(aUnionFeature.results()) > 0)
aUnionFeature.selectionList("base_objects").append(anExtrusionResult.subResult(2), None);
aSession.finishOperation()
assert (len(aUnionFeature.results()) > 0)