List<Optimiser> optimisers = new LinkedList<Optimiser>();
optimisers.add(addCandidatePeDetails);
optimisers.add(addDataSourceAnchors);
optimisers.add(processDataSourceAnchors);
optimisers.add(new PropagateGatewayAllocations());
optimisers.add(new AddExternalIONodes());
engine.setOptimisers(optimisers);
// the request context with the local DISPEL process EPR
engine.setRequestContext(new MockRequestContext());