SLF4J Smack Debugging Logger
Wait for Socks5TestProxy initialization

to prevent

org.jivesoftware.smackx.bytestreams.socks5.Socks5ClientForInitiatorTest
  > shouldSuccessfullyEstablishConnectionAndActivateSocks5Proxy
    FAILED
    java.lang.NullPointerException at Socks5ClientForInitiatorTest.java:292