assertEquals("_", ldapManager.replaceWithUnderscores("<"));
        assertEquals("_", ldapManager.replaceWithUnderscores(">"));

        assertEquals("_a_", ldapManager.replaceWithUnderscores("/a/"));
        assertEquals("___", ldapManager.replaceWithUnderscores("///"));
        assertEquals("a_a", ldapManager.replaceWithUnderscores("a/a"));
    }

    public void test_allowEmptyGroupAndRole() {

search_engine.http.ssl.certificate_authorities=
search_engine.username=
search_engine.password=
search_engine.heartbeat_interval=10000

# Cryptographer
app.cipher.algorism=aes
app.cipher.key=___change__me___
app.digest.algorism=sha256
app.encrypt.property.pattern=.*password|.*key|.*token|.*secret

app.extension.names=

app.audit.log.format=

# JVM options
jvm.crawler.options=\
-Djava.awt.headless=true\n\

    /** The key of the configuration. e.g. aes */
    String APP_CIPHER_ALGORISM = "app.cipher.algorism";

    /** The key of the configuration. e.g. ___change__me___ */
    String APP_CIPHER_KEY = "app.cipher.key";

    /** The key of the configuration. e.g. sha256 */
    String APP_DIGEST_ALGORISM = "app.digest.algorism";