question: private void checkLog ( IgniteLogger log ) { assert ! log . isDebugEnabled ( ) ; assert log . isInfoEnabled ( ) ; log . debug ( "This is 'debug' message." ) ; log . info ( "This is 'info' message." ) ; log . warning ( "This is 'warning' message." ) ; log . warning ( "This is 'warning' message." , new Exception ( "It's a test warning exception" ) ) ; log . error ( "This is 'error' message." ) ; log . error ( "This is 'error' message." , new Exception ( "It's a test error exception" ) ) ; }
target:  Tests log4j logging SPI.