Before:
  Save g:ale_filetype_blacklist

  " Delete some variable which should be defined.
  unlet! g:ale_filetype_blacklist

After:
  Restore

  call ale#ResetErrorDelays()

Execute(ALE should stop queuing for a while after exceptions are thrown):
  AssertThrows call ale#Queue(100)
  call ale#Queue(100)

Execute(ALE should stop linting for a while after exceptions are thrown):
  AssertThrows call ale#Lint()
  call ale#Lint()

Execute(ALE should stop echoing messages for a while after exceptions are thrown):
  AssertThrows call ale#cursor#EchoCursorWarning()
  call ale#cursor#EchoCursorWarning()