`vim-test` has some functionality that seemingly always sets up the correct project root: https://github.com/vim-test/vim-test/blob/6517577d8b75c97ce0a916f44942877beb37d72a/plugin/test.vim#L60 It would be great if there was some variable that one could use to tweak the path where `CoverageLoad` expects to find the `coverage_file`.