if ( args.size() != 0 ) {
String[] a = args.get( 0 );
String name = a[0].trim();
String leftInput = a[1].trim();
LeftTupleSource leftTupleSource = (LeftTupleSource) context.get( leftInput );
LeftTupleSink mockedSink = Mockito.mock( LeftTupleSink.class,
Mockito.withSettings().extraInterfaces( DSLMock.class ) );
leftTupleSource.addTupleSink( mockedSink );
context.put( name,
mockedSink );
} else {