public void someAction(@Optional final String foo) {
}
}
final Method method = findMethod(Customer.class, "someAction", new Class[] { String.class });
facetFactory.processParams(new ProcessParameterContext(method, 0, facetedMethodParameter));
final Facet facet = facetedMethodParameter.getFacet(MandatoryFacet.class);
assertNotNull(facet);
assertTrue(facet instanceof MandatoryFacetOnParameterInvertedByOptionalAnnotation);
}