Disable scalatest logging statements when running tests from maven

Alternatively, you can throw this bit of code anywhere in one of your tests,

org.slf4j.LoggerFactory.getLogger(org.slf4j.Logger.ROOT_LOGGER_NAME)
  .asInstanceOf[ch.qos.logback.classic.Logger]
  .setLevel(ch.qos.logback.classic.Level.WARN)

which will set all logging to the WARN level.

Those log messages are not actually being printed by ScalaTest, but by something you are using from your ScalaTest tests. The reason "ScalaTest" shows up in them is that ScalaTest does change the name of threads when suites and tests are executed, so that if someone has a suite that hangs forever and does a thread dump to investigate, it is more obvious what test and suite is causing the run to hang. Log4J seems to print out the thread name in square brackets, so that can give you a hint as to where these log messages are coming from.