Consider releasing an equivalent of the old Microsoft.Activities.UnitTesting package based on CoreWf

[Jimit Ndiaye]

The TestObjects project in the repository could be a good start. Would need cleaning up so it can stand on its own.

Currently as far as I am aware there is nothing that fills this hole and I'm sure most consumers of CoreWf end up rolling their own (which is non-trivial if you want to cover anything but simple WorkflowInvoker scenarios).