Changes to an item group within a target are only visible to other targets after the changing target exits. So to get the list of test assemblies to stick, you may have to move actually setting up the targets to its own target as in the following.
In "MSBuild" task you can pass properties to targets, but I'm not sure if it will work for ItemGroup. But you definitely can do it through batching - passing one assembly at a time.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.