} catch (Exception e) {
                    throw new RuntimeException("Failed to initialize prop field", e);
                }
            }

            @Override
            public String getIndexFieldTitle() {
                return "title";
            }

            @Override
            public String getIndexFieldContent() {
                return "content";
            }

            @Override

                // Override to return empty string instead of null to avoid NullPointerException
                return "";
            }

            @Override
            public String getIndexFieldTitle() {
                return "title";
            }

            @Override
            public String getIndexFieldContent() {
                return "content";
            }

            @Override

            @Override
            public String getIndexFieldUrl() {
                return "url";
            }

            @Override
            public String getIndexFieldTitle() {
                return "title";
            }
        });
    }

    @Override
    protected void tearDown(TestInfo testInfo) throws Exception {
        ComponentUtil.setFessConfig(null);

                // Override to return empty string instead of null to avoid NullPointerException
                return "";
            }

            @Override
            public String getIndexFieldTitle() {
                return "title";
            }

            @Override
            public String getIndexFieldContent() {
                return "content";
            }

            @Override

            }

            @Override
            public String getIndexFieldCreated() {
                return "created";
            }

            @Override
            public String getIndexFieldTitle() {
                return "title";
            }

            @Override
            public String getIndexFieldDigest() {
                return "digest";
            }

            @Override

            }

            @Override
            public String getIndexFieldCreated() {
                return "created";
            }

            @Override
            public String getIndexFieldTitle() {
                return "title";
            }

            @Override
            public String getIndexFieldDigest() {
                return "digest";
            }

            @Override

                    fessConfig.getIndexFieldFiletype(), //
                    fessConfig.getIndexFieldFilename(), //
                    fessConfig.getIndexFieldCreated(), //
                    fessConfig.getIndexFieldTitle(), //
                    fessConfig.getIndexFieldDigest(), //
                    fessConfig.getIndexFieldUrl(), //
                    fessConfig.getIndexFieldThumbnail(), //

            final DefaultQueryBuilderFunction builder) {
        final DefaultQueryBuilder defaultQuery = createDefaultQueryBuilder();
        defaultQuery.add(builder.apply(fessConfig.getIndexFieldTitle(), fessConfig.getQueryBoostTitleAsDecimal().floatValue()));
        defaultQuery.add(builder.apply(fessConfig.getIndexFieldContent(), fessConfig.getQueryBoostContentAsDecimal().floatValue()));

    public void test_indexFieldBoost() {
        assertEquals("boost", fessConfig.getIndexFieldBoost());
    }

    @Test
    public void test_indexFieldTitle() {
        assertEquals("title", fessConfig.getIndexFieldTitle());
    }

    @Test
    public void test_indexFieldContent() {
        assertEquals("content", fessConfig.getIndexFieldContent());
    }

    @Test
    public void test_indexFieldCache() {

        final String indexFieldDocId = fessConfig.getIndexFieldDocId();
        final String indexFieldContentLength = fessConfig.getIndexFieldContentLength();
        final String indexFieldTitle = fessConfig.getIndexFieldTitle();
        final String indexFieldContent = fessConfig.getIndexFieldContent();
        final String indexFieldFavoriteCount = fessConfig.getIndexFieldFavoriteCount();