private final String[] parts;
        private final Long[] numericParts;
        private final DefaultVersion baseVersion;

        public DefaultVersion(String source, List<String> parts, DefaultVersion baseVersion) {
            this.source = source;
            this.parts = parts.toArray(new String[0]);
            this.numericParts = new Long[this.parts.length];
            for (int i = 0; i < parts.size(); i++) {

    }

    def "numeric parts are parsed"() {
        expect:
        def version = parse(versionStr)
        version.numericParts == numericParts.collect { it == null ? null : it.toLong() }.toArray()

        where:
        versionStr        | numericParts
        "1.2.3"           | [1, 2, 3]
        "1.2-3"           | [1, 2, 3]
        "1.2-beta_3+0000" | [1, 2, null, 3, 0]

        Long[] numericParts1 = version1.getNumericParts();
        Long[] numericParts2 = version2.getNumericParts();

        int i = 0;
        for (; i < parts1.length && i < parts2.length; i++) {
            String part1 = parts1[i];
            String part2 = parts2[i];

            Long numericPart1 = numericParts1[i];
            Long numericPart2 = numericParts2[i];