Comment 1 for bug 2015891

Yes, this will be the first release that supports both juju 3.1 as well as continuing to support juju 3.0 and 2.9

There's a different requirements-2.9.txt in the repo to use when targeting a juju 2.9 controller

before starting the tests ensure you have the correct pip requirements installed

if bootstrapping a juju 2.9 controller:
pip-sync requirements-2.9.txt

if bootstrapping a later controller
pip-sync requirements.txt

```
source juju.bash
juju::pip::2.9
```