How to suppress Spark logging in unit tests?

Add the following code into the log4j.properties file inside the src/test/resources dir, create the file/dir if not exist

# Change this to set Spark log level
log4j.logger.org.apache.spark=WARN

# Silence akka remoting
log4j.logger.Remoting=WARN

# Ignore messages below warning level from Jetty, because it's a bit verbose
log4j.logger.org.eclipse.jetty=WARN

When I run my unit tests (I’m using JUnit and Maven), I only receive WARN level logs, in other words no more cluttering with INFO level logs (though they can be useful at times for debugging).

I hope this helps.