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

After:
  call ale#test#RestoreDirectory()
  call ale#linter#Reset()

Execute(smlnj finds CM file if it exists):
  call ale#test#SetFilename('smlnj/cm/foo.sml')

  AssertEqual
  \ ale#path#Simplify(g:dir . '/smlnj/cm/sources.cm'),
  \ ale#handlers#sml#GetCmFile(bufnr('%'))

Execute(smlnj finds CM file by searching upwards):
  call ale#test#SetFilename('smlnj/cm/path/to/bar.sml')

  AssertEqual
  \ ale#path#Simplify(g:dir . '/smlnj/cm/sources.cm'),
  \ ale#handlers#sml#GetCmFile(bufnr('%'))

Execute(smlnj returns '' when no CM file found):
  call ale#test#SetFilename('smlnj/file/qux.sml')

  AssertEqual '', ale#handlers#sml#GetCmFile(bufnr('%'))

Execute(CM-project mode enabled when CM file found):
  call ale#test#SetFilename('smlnj/cm/foo.sml')

  AssertEqual 'sml', ale#handlers#sml#GetExecutableSmlnjCm(bufnr('%'))

Execute(single-file mode disabled when CM file found):
  call ale#test#SetFilename('smlnj/cm/foo.sml')

  AssertEqual '', ale#handlers#sml#GetExecutableSmlnjFile(bufnr('%'))

Execute(CM-project mode disabled when CM file not found):
  call ale#test#SetFilename('smlnj/file/qux.sml')

  AssertEqual '', ale#handlers#sml#GetExecutableSmlnjCm(bufnr('%'))

Execute(single-file mode enabled when CM file found):
  call ale#test#SetFilename('smlnj/file/qux.sml')

  AssertEqual 'sml', ale#handlers#sml#GetExecutableSmlnjFile(bufnr('%'))