conf.put(ps);
CompositeOperation cop = delegate.updateGenerateOperationFromProperties(conf, new Address());
assert cop.numberOfSteps() == 1;
Operation step1 = cop.step(0);
assert step1.getOperation().equals("write-attribute");
Map<String, Object> props = step1.getAdditionalProperties();
assert props.size() == 2;
assert props.get("name").equals("mode");
assert props.get("value")==null; // no value