Index: sources/VTreatmentBegin.h
===================================================================
diff -u -r321e667cd58da515845f2173d5e1a59082823455 -r0d59385f134f65a19dace1e2b46eb2631924396e
--- sources/VTreatmentBegin.h	(.../VTreatmentBegin.h)	(revision 321e667cd58da515845f2173d5e1a59082823455)
+++ sources/VTreatmentBegin.h	(.../VTreatmentBegin.h)	(revision 0d59385f134f65a19dace1e2b46eb2631924396e)
@@ -7,12 +7,18 @@
 // Project
 #include "main.h"
 
+// forward declarations
+class tst_views;
+
 namespace View {
 
 class VTreatmentBegin : public QObject
 {
     Q_OBJECT
 
+    // friends
+    friend class ::tst_views;
+
 public:
     explicit VTreatmentBegin(QObject *parent = nullptr);