/**
     * Default constructor that creates a DocBoostMatcher with default script type.
     * Uses the default script engine as defined in Constants.DEFAULT_SCRIPT.
     */
    public DocBoostMatcher() {
        scriptType = Constants.DEFAULT_SCRIPT;
    }

    /**
     * Constructor that creates a DocBoostMatcher from a BoostDocumentRule.
     *

    }

    @Test
    public void test_getValue_nullMap() {
        final DocBoostMatcher docBoostMatcher = new DocBoostMatcher();
        docBoostMatcher.setBoostExpression("10");
        assertEquals(0.0f, docBoostMatcher.getValue(null));
    }

    @Test
    public void test_getValue_emptyMap() {
        final DocBoostMatcher docBoostMatcher = new DocBoostMatcher();

            addFavoriteCountField(map);
        }

        float documentBoost = 0.0f;
        for (final DocBoostMatcher docBoostMatcher : docBoostMatcherList) {
            if (docBoostMatcher.match(map)) {
                documentBoost = docBoostMatcher.getValue(map);
                break;
            }
        }

        if (documentBoost > 0) {

        indexUpdater.setDaemon(true);
        indexUpdater.setCrawlerList(crawlerList);
        getAvailableBoostDocumentRuleList().forEach(rule -> {
            indexUpdater.addDocBoostMatcher(new org.codelibs.fess.indexer.DocBoostMatcher(rule));
        });
        indexUpdater.start();

        int startedCrawlerNum = 0;
        int activeCrawlerNum = 0;
        try {
            while (startedCrawlerNum < crawlerList.size()) {