Support TestEnv.activate to activate old package management

[schlichtanders]

Hi there, I just run into the wish to activate the test environment of my current project - inside Pluto! (aka using Pluto as the IDE).

Pluto already supports a couple of different triggers to activate the old package management, but not yet TestEnv.activate

https://github.com/fonsp/Pluto.jl/blob/be51e4bf8ceaf14bbc5977892a9ac74afefb54c0/src/packages/Packages.jl#L20C1-L35

[fonsp]

That would be great! Can you make a PR? You don't need to add a test.

[schlichtanders]

I am wondering whether what I wished for makes actually sense.

• If I want to use TestEnv.activate, I somehow need access to TestEnv ...
• and for the script-file to also be valid, I probably should install it inside another "activation" environment (could also be the projects normal environment)
• hence I will anyway use something like Pkg.activate("my-TestEnv-bootstrap-environment"); import TestEnv; TestEnv.activate("actual-environment")

Summary: now I think TestEnv is already perfectly supported. Closing this issue for now.