Before:
  runtime ale_linters/yaml/circleci.vim

After:
  call ale#linter#Reset()

Execute(The circlei handler should return nothing when configs are valid):
  AssertEqual
  \ [],
  \ ale_linters#yaml#circleci#Handle(0, [
  \ 'Config input is valid.',
  \ ])

Execute(The circlei handler put errors at the top when something is wrong):
  AssertEqual
  \ [
  \   {
  \     'lnum': 1,
  \     'type': 'E',
  \     'text': '[#/jobs] expected type: Mapping, found: Integer',
  \     'detail': join([
  \       '[#/jobs] expected type: Mapping, found: Integer',
  \       'Jobs is a map',
  \       'SCHEMA:',
  \       '  type: object',
  \       'INPUT:',
  \       '  4',
  \     ], "\n"),
  \   },
  \ ],
  \ ale_linters#yaml#circleci#Handle(0, [
  \ 'Error: ERROR IN CONFIG FILE:',
  \ '[#/jobs] expected type: Mapping, found: Integer',
  \ 'Jobs is a map',
  \ 'SCHEMA:',
  \ '  type: object',
  \ 'INPUT:',
  \ '  4',
  \ ])