IssueTracker

As I understand it, we need to migrate namespace definitions both from AndroidManifest.xml and from implicit definitions from applicationId / testApplicationId? Is that right? So an 8.0 project would have a

namespace <n>
testNamespace <tn>

where <n> is taken from AndroidManifest.xml package definitions if present, and applicationId if not, and <tn> is testApplicationId if present and <n>.test if not?

Sorry for the confusion. AGP would change how it computes the namespace for the androidTest variant. All the Upgrade assistant would need to do is update the source code for the import of the R class.

OK! And, I think, this should happen at the same time as the namespace declaration is migrated from AndroidManifest.xml?

It's unrelated, but it is possible that we move 8.0 to also only declare the namespace into the DSL. I would make it a separate refactoring because they are not tied at all.

I would consider first adding the right new value to models (as a new property) and then, to avoid Studio interpreting manifests and build configurations, just update to whatever the synced value of this new property is.