return null;
        }

        ModelReference<?> subjectReference = ruleDefinition.getSubjectReference();
        ModelType<?> subjectType = subjectReference.getType();
        Class<?> rawSubjectType = subjectType.getRawClass();
        if (!rawSubjectType.equals(TypeBuilder.class)) {

        ruleExtractor.registration(_, _) >> { MethodRuleDefinition method, MethodModelRuleExtractionContext context ->
            return Stub(ExtractedModelRule) {
                getRuleDependencies() >> [method.getSubjectReference().getType().getConcreteClass()]
            }
        }

        expect:
        extractor.extract(RuleSourceWithDependencies).getRequiredPlugins() == [Long.class, String.class]
    }