result = vm.execute( "d", "1", null );
assertNull( result.getError() );
assertTrue( result.getStack().size() == 0 );
result = vm.execute( "ddddd", "1, 2, 3, 4, 5, 6, 7, 8, 9", null );
assertNull( result.getError() );
assertTrue( result.getStack().size() == 4 );
assertTrue( result.getStack().pop() == 4 );
assertTrue( result.getStack().pop() == 3 );
assertTrue( result.getStack().pop() == 2 );