// Should handle various keywords including empty string
        assertNotNull(functionBuilders);
        assertEquals(0, functionBuilders.size()); // No data loaded
    }

    public void test_buildQuery_withNullKeywordsInList() {
        List<String> keywordList = Arrays.asList("java", null, "programming");
        List<FilterFunctionBuilder> functionBuilders = new ArrayList<>();

        try {
            try {