def "can extract super types"() {
        expect:
        ClassInspector.inspect(Object).superTypes.empty
        ClassInspector.inspect(Serializable).superTypes.empty
        ClassInspector.inspect(Set).superTypes.toList() == [Collection, Iterable]
    }

    def "super types ordered by their distance"() {
        expect:

        Class<?> targetType = target.getClass();
        synchronized (PROPERTY_CACHE) {
            Set<String> cached = PROPERTY_CACHE.get(targetType);
            if (cached == null) {
                cached = ClassInspector.inspect(targetType).getPropertyNames();
                PROPERTY_CACHE.put(targetType, cached);
            }
            return cached;
        }
    }

    @Nullable