Before:
  call ale#test#SetDirectory('/testplugin/test')

After:
  call ale#test#RestoreDirectory()

Execute(We should be able to find a directory some directory down):
  call ale#test#SetFilename('test-files/top/middle/bottom/dummy.txt')

  AssertEqual
  \ ale#path#Simplify(expand('%:p:h:h:h:h:h') . '/test-files/top/ale-special-directory-name-dont-use-this-please/'),
  \ ale#path#FindNearestDirectory(bufnr('%'), 'ale-special-directory-name-dont-use-this-please')

Execute(We shouldn't find anything for files which don't match):
  AssertEqual
  \ '',
  \ ale#path#FindNearestDirectory(bufnr('%'), 'ale-this-should-never-match-anything')