assertNoneType(new NBinOp(null, null, null));
assertNoneType(new NBlock(null));
assertNoneType(new NBody((List<NNode>)null));
assertNoneType(new NBoolOp(null, null));
assertNoneType(new NBreak());
assertNoneType(new NCall(null, null, null, null, null));
assertNoneType(new NClassDef(null, null, null));
assertNoneType(new NCompare(null, null, null));
assertNoneType(new NComprehension(null, null, null));
assertNoneType(new NContinue());
assertNoneType(new NDelete(null));