Before:
  " Load the file which defines the linter.
  runtime ale_linters/terraform/terraform.vim

After:
  " Unload all linters again.
  call ale#linter#Reset()

Execute(The output should be correct):
  AssertEqual
  \ [
  \   {
  \     'lnum': 1,
  \     'col': 20,
  \     'type': 'E',
  \     'text': 'illegal char',
  \   },
  \   {
  \     'lnum': 2,
  \     'col': 14,
  \     'type': 'E',
  \     'text': 'literal not terminated',
  \   },
  \   {
  \     'lnum': 1,
  \     'type': 'E',
  \     'text': 'object expected closing RBRACE got: EOF',
  \   },
  \ ],
  \ ale_linters#terraform#terraform#Handle(bufnr(''), [
  \ 'Error running fmt: In <standard input>: At 1:20: illegal char',
  \ 'Error running fmt: In <standard input>: At 2:14: literal not terminated',
  \ 'Error running fmt: In <standard input>: object expected closing RBRACE got: EOF',
  \ ])