Before:
  let b:tmp = has('win32') ? substitute($TMP, '\\', '\\\\', 'g') : $TMPDIR

  runtime ale_linters/elm/make.vim

After:
  unlet! b:tmp
  unlet! g:config_error_lines

  call ale#linter#Reset()

Execute(The elm-make handler should parse lines correctly):
  AssertEqual
  \ [
  \   {
  \     'lnum': 404,
  \     'col': 1,
  \     'end_lnum': 408,
  \     'end_col': 18,
  \     'type': 'E',
  \     'text': 'TYPE MISMATCH',
  \     'detail': "error details 1 styled details"
  \   },
  \   {
  \     'lnum': 406,
  \     'col': 5,
  \     'end_lnum': 407,
  \     'end_col': 17,
  \     'type': 'E',
  \     'text': 'TYPE MISMATCH',
  \     'detail': "error details 2",
  \   },
  \   {
  \     'lnum': 406,
  \     'col': 5,
  \     'end_lnum': 406,
  \     'end_col': 93,
  \     'type': 'E',
  \     'text': 'TYPE MISMATCH',
  \     'detail': "error details 3",
  \   },
  \ ],
  \ ale_linters#elm#make#Handle(347, [
  \   '{
  \      "type":"compile-errors",
  \      "errors": [
  \        {
  \          "path": "' . b:tmp . 'Module.elm",
  \          "problems": [
  \            {
  \              "title": "TYPE MISMATCH",
  \              "message": ["error details 1 ", { "string": "styled details" }],
  \              "region": { "start": { "line": 404, "column":1 }, "end": { "line":408, "column":18} }
  \            },
  \            {
  \              "title": "TYPE MISMATCH",
  \              "message": ["error details 2"],
  \              "region": { "start": {"line": 406, "column": 5}, "end": {"line": 407, "column": 17} }
  \            },
  \            {
  \              "title": "TYPE MISMATCH",
  \              "message": ["error details 3"],
  \              "region": { "start": { "line": 406, "column": 5}, "end": {"line": 406, "column":93 } }
  \            }
  \          ]
  \        }
  \      ]
  \    }'
  \ ])

Execute(The elm-make handler should put an error on the first line if a line cannot be parsed):
  AssertEqual
  \ [
  \   {
  \     'lnum': 404,
  \     'col': 1,
  \     'end_lnum': 408,
  \     'end_col': 18,
  \     'type': 'E',
  \     'text': 'TYPE MISMATCH',
  \     'detail': "error details 1 styled details"
  \   },
  \   {
  \     'lnum': 1,
  \     'type': 'E',
  \     'text': 'Not JSON',
  \     'detail': "Not JSON\nAlso not JSON",
  \   },
  \ ],
  \ ale_linters#elm#make#Handle(347, [
  \   '{
  \      "type":"compile-errors",
  \      "errors": [
  \        {
  \          "path": "' . b:tmp . 'Module.elm",
  \          "problems": [
  \            {
  \              "title": "TYPE MISMATCH",
  \              "message": ["error details 1 ", { "string": "styled details" }],
  \              "region": { "start": { "line": 404, "column":1 }, "end": { "line":408, "column":18} }
  \            }
  \          ]
  \        }
  \      ]
  \    }',
  \    "Not JSON",
  \    "Also not JSON",
  \ ])