DomainObjectSet | ArrayList
        Set             | LinkedHashSet
        SortedSet       | TreeSet
    }

    def "maps map types"() {
        expect:
        def map = mapper.createEmptyMap(sourceType)
        map.getClass() == mapType

        where:
        sourceType | mapType
        Map        | LinkedHashMap
        SortedMap  | TreeMap
    }

            return new TreeSet<Object>();
        }
        throw new UnsupportedOperationException(String.format("Cannot convert a Collection to type %s.", collectionType.getName()));
    }

    Map<Object, Object> createEmptyMap(Class<?> mapType) {
        if (mapType.isAssignableFrom(LinkedHashMap.class)) {
            return new LinkedHashMap<Object, Object>();
        }
        if (mapType.isAssignableFrom(TreeMap.class)) {