final Exception javaException = new IllegalArgumentException("javaException");
final Exception stingException = new ReviewedGATKException("GATKException");
final Exception userException = new UserException("userException");
final GenomeAnalysisEngine engine = new GenomeAnalysisEngine();
engine.setArguments(new GATKArgumentCollection());
for ( final Walker walker : Arrays.asList(readWalker, lociWalker, rodWalker, artWalker) ) {
for ( final Exception exception : Arrays.asList(noException, javaException, stingException, userException) ) {
tests.add(new Object[]{walker, exception, engine});
}