for (ExtractedRuleDetails details : rules) {
                plugins.addAll(details.rule.getRuleDependencies());
            }
            return plugins;
        }

        @Override
        public void assertNoPlugins() {
            for (ExtractedRuleDetails details : rules) {
                if (!details.rule.getRuleDependencies().isEmpty()) {
                    StringBuilder message = new StringBuilder();

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

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