question: static public void doRejectionTest ( String data , Class exceptionClass ) { try { MIMEType t = new MIMEType ( data ) ; } catch ( Throwable t ) { if ( exceptionClass . isInstance ( t ) ) return ; t . printStackTrace ( System . err ) ; throw new AssertionFailedError2 ( "Should have thrown " + exceptionClass + " instead" + ", not " + t . getClass ( ) + " for data='" + data + "'" , t ) ; } throw new AssertionFailedError ( "Should have thrown " + exceptionClass + " for data='" + data + "'" ) ; }
target:  Test helper submits data that should produce an exception of the indicated class.