@Override
    public SortedSet<Path> convertFrom(String value) {
        if (value == null) {
            throw new ParameterException("Path list must not be null.");
        }

        return Arrays.stream(value.split(SEPARATOR))
                     .map(StringUtils::trimToNull)
                     .filter(Objects::nonNull)
                     .map(Paths::get)
                     .collect(Collectors.toCollection(sortedPathSupplier()));
    }
@Test
    public void testConvertFromEmpty() {
        assertEquals(new TreeSet<>(), converter.convertFrom(""));
    }