Execute(Open a file some directory down): silent! cd /testplugin/test :e! top/middle/bottom/dummy.txt Then(We should be able to find the local version of a file): AssertEqual \ expand('%:p:h:h:h:h') . '/top/example.ini', \ ale#util#ResolveLocalPath(bufnr('%'), 'example.ini', '/global/config.ini') Execute(Do nothing): Then(We shouldn't find anything for files which don't match): AssertEqual \ '/global/config.ini', \ ale#util#ResolveLocalPath(bufnr('%'), 'missing.ini', '/global/config.ini')