String[] tags = { "long_tag_" + "y".repeat(50), "another_long_tag_" + "z".repeat(50) };
        String[] roles = { "long_role_" + "a".repeat(50) };
        String[] fields = { "long_field_" + "b".repeat(50) };
        String[] excludes = { "long_exclude_" + "c".repeat(50) };

        String result = popularWordHelper.getCacheKey(seed, tags, roles, fields, excludes);

        assertNotNull(result);

        String longFieldsStr = fessConfig.getIndexAdminLongFields();
        assertEquals("", longFieldsStr);
        String[] longFields = longFieldsStr.isEmpty() ? new String[0] : longFieldsStr.split(",");
        assertNotNull(longFields);
        assertEquals(0, longFields.length);

        String floatFieldsStr = fessConfig.getIndexAdminFloatFields();
        assertEquals("", floatFieldsStr);