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Minimal test - lines (16, 53)

Code

class InkCollectorEvent final : public _IInkCollectorEvents {
 public:
  // IUnknown
  HRESULT __stdcall QueryInterface(REFIID aRiid, void** aObject);
  virtual ULONG STDMETHODCALLTYPE AddRef() { return ++mRefCount; }
  virtual ULONG STDMETHODCALLTYPE Release() {
    MOZ_ASSERT(mRefCount);
    if (!--mRefCount) {
      delete this;
      return 0;
    }
    return mRefCount;
  }

 protected:
  // IDispatch
  STDMETHOD(GetTypeInfoCount)(UINT* aInfo) { return E_NOTIMPL; }
  STDMETHOD(GetTypeInfo)(UINT aInfo, LCID aId, ITypeInfo** aTInfo) {
    return E_NOTIMPL;
  }
  STDMETHOD(GetIDsOfNames)
  (REFIID aRiid, LPOLESTR* aStrNames, UINT aNames, LCID aId, DISPID* aDispId) {
    return E_NOTIMPL;
  }
  STDMETHOD(Invoke)
  (DISPID aDispIdMember, REFIID aRiid, LCID aId, WORD wFlags,
   DISPPARAMS* aDispParams, VARIANT* aVarResult, EXCEPINFO* aExcepInfo,
   UINT* aArgErr);

  // InkCollectorEvent
  void CursorOutOfRange(IInkCursor* aCursor) const;
  bool IsHardProximityTablet(IInkTablet* aTablet) const;

 private:
  uint32_t mRefCount = 0;

  ~InkCollectorEvent() = default;
};