Before:
  Save g:ale_warn_about_trailing_whitespace

After:
  Restore

Execute(The shellcheck handler should handle basic errors or warnings <0.7.0):
  AssertEqual
  \ [
  \   {
  \     'lnum': 2,
  \     'col': 1,
  \     'type': 'W',
  \     'text': 'In POSIX sh, ''let'' is not supported.',
  \     'code': 'SC2039',
  \     'detail': 'In POSIX sh, ''let'' is not supported.' . "\n\nFor more information:\n  https://www.shellcheck.net/wiki/" . 'SC2039',
  \   },
  \   {
  \     'lnum': 2,
  \     'col': 3,
  \     'type': 'E',
  \     'text': 'Don''t put spaces around the = in assignments.',
  \     'code': 'SC1068',
  \     'detail': 'Don''t put spaces around the = in assignments.' . "\n\nFor more information:\n  https://www.shellcheck.net/wiki/" . 'SC1068',
  \   },
  \ ],
  \ ale#handlers#shellcheck#Handle(bufnr(''), [0, 6, 0], [
  \   '-:2:1: warning: In POSIX sh, ''let'' is not supported. [SC2039]',
  \   '-:2:3: error: Don''t put spaces around the = in assignments. [SC1068]',
  \ ])

Execute(The shellcheck handler should handle notes <0.7.0):
  AssertEqual
  \ [
  \   {
  \     'lnum': 3,
  \     'col': 3,
  \     'type': 'I',
  \     'text': 'Double quote to prevent globbing and word splitting.',
  \     'code': 'SC2086',
  \     'detail': 'Double quote to prevent globbing and word splitting.' . "\n\nFor more information:\n  https://www.shellcheck.net/wiki/" . 'SC2086',
  \   },
  \ ],
  \ ale#handlers#shellcheck#Handle(bufnr(''), [0, 6, 0], [
  \   '-:3:3: note: Double quote to prevent globbing and word splitting. [SC2086]',
  \ ])

Execute(The shellcheck handler should handle basic errors or warnings >=0.7.0):
  AssertEqual
  \ [
  \   {
  \     'lnum': 2,
  \     'end_lnum': 3,
  \     'col': 1,
  \     'end_col': 1,
  \     'type': 'W',
  \     'text': 'In POSIX sh, ''let'' is not supported.',
  \     'code': 'SC2039',
  \     'detail': 'In POSIX sh, ''let'' is not supported.' . "\n\nFor more information:\n  https://www.shellcheck.net/wiki/" . 'SC2039',
  \   },
  \   {
  \     'lnum': 2,
  \     'end_lnum': 3,
  \     'col': 3,
  \     'end_col': 3,
  \     'type': 'E',
  \     'text': 'Don''t put spaces around the = in assignments.',
  \     'code': 'SC1068',
  \     'detail': 'Don''t put spaces around the = in assignments.' . "\n\nFor more information:\n  https://www.shellcheck.net/wiki/" . 'SC1068',
  \   },
  \ ],
  \ ale#handlers#shellcheck#Handle(bufnr(''), [0, 7, 0], [
  \   '{
  \     "comments": [
  \       {
  \         "file":"-",
  \         "line":2,
  \         "endLine":3,
  \         "column":1,
  \         "endColumn":2,
  \         "level":"warning",
  \         "code":2039,
  \         "message":"In POSIX sh, ''let'' is not supported.",
  \         "fix": null
  \       },
  \       {
  \         "file":"-",
  \         "line":2,
  \         "endLine":3,
  \         "column":3,
  \         "endColumn":4,
  \         "level":"error",
  \         "code":1068,
  \         "message":"Don''t put spaces around the = in assignments.",
  \         "fix": null
  \       }
  \     ]
  \   }'
  \ ])

Execute(The shellcheck handler should handle info and style >=0.7.0):
  AssertEqual
  \ [
  \   {
  \     'lnum': 3,
  \     'end_lnum': 5,
  \     'col': 3,
  \     'end_col': 4,
  \     'type': 'I',
  \     'text': 'Double quote to prevent globbing and word splitting.',
  \     'code': 'SC2086',
  \     'detail': 'Double quote to prevent globbing and word splitting.' . "\n\nFor more information:\n  https://www.shellcheck.net/wiki/" . 'SC2086',
  \   },
  \   {
  \     'lnum': 13,
  \     'end_lnum': 13,
  \     'col': 17,
  \     'end_col': 27,
  \     'type': 'I',
  \     'text': '$/${} is unnecessary on arithmetic variables.',
  \     'code': 'SC2004',
  \     'detail': '$/${} is unnecessary on arithmetic variables.' . "\n\nFor more information:\n  https://www.shellcheck.net/wiki/" . 'SC2004',
  \   }
  \ ],
  \ ale#handlers#shellcheck#Handle(bufnr(''), [0, 7, 0], [
  \   '{
  \     "comments": [
  \       {
  \         "file": "-",
  \         "line": 3,
  \         "endLine": 5,
  \         "column": 3,
  \         "endColumn": 5,
  \         "level": "info",
  \         "code": 2086,
  \         "message": "Double quote to prevent globbing and word splitting.",
  \         "fix": null
  \       },
  \       {
  \         "file": "-",
  \         "line": 13,
  \         "endLine": 13,
  \         "column": 17,
  \         "endColumn": 28,
  \         "level": "style",
  \         "code": 2004,
  \         "message": "$/${} is unnecessary on arithmetic variables.",
  \         "fix": null
  \       }
  \     ]
  \   }'
  \ ])

Execute(shellcheck errors for trailing whitespace should show by default):
  AssertEqual
  \ [
  \   {
  \     'lnum': 8,
  \     'col': 12,
  \     'code': 'SC1101',
  \     'end_lnum': 8,
  \     'type': 'E',
  \     'end_col': 11,
  \     'text': 'Delete trailing spaces after \ to break line (or use quotes for literal space).',
  \     'detail': 'Delete trailing spaces after \ to break line (or use quotes for literal space).' . "\n\nFor more information:\n  https://www.shellcheck.net/wiki/" . 'SC1101',
  \   },
  \ ],
  \ ale#handlers#shellcheck#Handle(bufnr(''), [0, 7, 0], [
  \   '{
  \     "comments": [
  \       {
  \         "file": "-",
  \         "line": 8,
  \         "endLine": 8,
  \         "column": 12,
  \         "endColumn": 12,
  \         "level": "error",
  \         "code":1101,
  \         "message":"Delete trailing spaces after \\ to break line (or use quotes for literal space).",
  \         "fix":null
  \       }
  \     ]
  \   }',
  \ ])

Execute(shellcheck errors for trailing whitepsace should be able to be silenced by ale_warn_about_trailing_whitespace):
  let g:ale_warn_about_trailing_whitespace = 0

  AssertEqual
  \ [],
  \ ale#handlers#shellcheck#Handle(bufnr(''), [0, 7, 0], [
  \   '{
  \     "comments": [
  \       {
  \         "file": "-",
  \         "line": 8,
  \         "endLine": 8,
  \         "column": 12,
  \         "endColumn": 12,
  \         "level": "error",
  \         "code":1101,
  \         "message":"Delete trailing spaces after \\ to break line (or use quotes for literal space).",
  \         "fix":null
  \       }
  \     ]
  \   }',
  \ ])