activate_with function

[mmiller-max]

What do you think about adding an activate_with function that allows additional dependencies to be added to the test environment?

The use case I'm thinking of is to avoid having to do this, which doesn't work in the situation where the TestReports is already in the package deps (issue). I think it can be done using more of package internals (which is less nice).

I think this could be done by creating a new override project to pass in via the test_project_override arg here, with lots of careful checking of whether or not the additional package is already in the project/test deps. Also ideally the version used of the additional package would come from the calling environment (e.g. if it was a devd package, it would use the local dev version in the test environment).

[oxinabox]

maybe.
It seems difficult.