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