My KTD work flow process for bug testing is normally: 
1) koha clone: make sure on master, git pull 
2) koha-testing-docker clone: git pull, ktd pull, ktd up 
3) get into KTD: ktd --shell 
4) bug testing: git checkout -B bzXXXXX, git bz apply, updatedatabase, restart_all, etc. 
5) once finished testing: git checkout master, git branch -D bzXXXXX, git reset --hard origin/master, reset_all, git status (fix anything that is an issue so is clean)
next bug....