You can check current test version here https://pypi.org/project/boneio/#history
Assume test version is boneio==0.8.0dev2
mkdir ~/boneio_test
python3 -m venv ~/boneio_test/venv
source ~/boneio_test/venv/bin/activate
pip3 install boneio==0.8.0dev2
Now prepare your config according to release notes.