Show all git log entries that concern a certain (existing or non-existing) file path:

git log --all -- <path>

path is a git pathspec that can contain *s and ?s (more info here)

Add a modifier like --stat, --name-status or --name-only for more informative output

Example: Finding when that folder was deleted in order to restore it

git log --all --name-status  -- 'src/test/scala/se/appland/somefolder*'