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));