[DO NOT MERGE] Test root-project#20354 - 2

Author: vepadulano

tree/ntuple/test/StreamerField.hxx

@@ -69,18 +69,22 @@ class IgnoreUnsplitComment {
 struct PolyBase {
    virtual ~PolyBase() {}
    int x;
+   ClassDef(PolyBase, 3);
 };
 
 struct PolyA : public PolyBase {
    int a;
+   ClassDefOverride(PolyA, 3);
 };
 
 struct PolyB : public PolyBase {
    int b;
+   ClassDefOverride(PolyB, 3);
 };
 
 struct PolyContainer {
    std::unique_ptr<PolyBase> fPoly;
+   ClassDefNV(PolyContainer, 3);
 };
 
 template <typename T>