facetFactory.process(new ProcessClassContext(Customer.class, methodRemover, facetedMethod));
final Facet facet = facetedMethod.getFacet(ImmutableFacet.class);
assertNotNull(facet);
assertTrue(facet instanceof ImmutableFacetMarkerInterface);
final ImmutableFacetMarkerInterface immutableFacetMarkerInterface = (ImmutableFacetMarkerInterface) facet;
assertEquals(org.apache.isis.core.metamodel.facets.When.ONCE_PERSISTED, immutableFacetMarkerInterface.value());
assertNoMethodsRemoved();
}