Execute (Run HandleCSSLintFormat):
  let g:loclist = ale#handlers#HandleCSSLintFormat(42, [
  \ 'something.css: line 2, col 1, Error - Expected RBRACE at line 2, col 1. (errors)',
  \ "something.css: line 2, col 5, Warning - Expected ... but found 'wat'. (known-properties)",
  \])

Then (The loclist should be correct):
  AssertEqual [
  \ {
  \   'bufnr': 42,
  \   'vcol': 0,
  \   'nr': -1,
  \   'lnum': 2,
  \   'col': 1,
  \   'type': 'E',
  \   'text': '(errors) Expected RBRACE at line 2, col 1.',
  \ },
  \ {
  \   'bufnr': 42,
  \   'vcol': 0,
  \   'nr': -1,
  \   'lnum': 2,
  \   'col': 5,
  \   'type': 'W',
  \   'text': "(known-properties) Expected ... but found 'wat'.",
  \ },
  \], g:loclist

Execute (Run HandleGCCFormat):
  let g:loclist = ale#handlers#HandleGCCFormat(42, [
  \ '<stdin>:8:5: warning: conversion lacks type at end of format [-Wformat=]',
  \ '<stdin>:10:27: error: invalid operands to binary - (have ‘int’ and ‘char *’)',
  \])

Then (The loclist should be correct):
  AssertEqual [
  \ {
  \   'bufnr': 42,
  \   'vcol': 0,
  \   'nr': -1,
  \   'lnum': 8,
  \   'col': 5,
  \   'type': 'W',
  \   'text': 'conversion lacks type at end of format [-Wformat=]',
  \ },
  \ {
  \   'bufnr': 42,
  \   'vcol': 0,
  \   'nr': -1,
  \   'lnum': 10,
  \   'col': 27,
  \   'type': 'E',
  \   'text': 'invalid operands to binary - (have ‘int’ and ‘char *’)',
  \ },
  \], g:loclist

Execute (Run HandleUnixFormatAsError):
  let g:loclist = ale#handlers#HandleUnixFormatAsError(42, [
  \ 'file.go:27: missing argument for Printf("%s"): format reads arg 2, have only 1 args',
  \ 'file.go:53:10: if block ends with a return statement, so drop this else and outdent its block (move short variable declaration to its own line if necessary)',
  \])

Then (The loclist should be correct):
  AssertEqual [
  \ {
  \   'bufnr': 42,
  \   'vcol': 0,
  \   'nr': -1,
  \   'lnum': 27,
  \   'col': 0,
  \   'type': 'E',
  \   'text': 'missing argument for Printf("%s"): format reads arg 2, have only 1 args',
  \ },
  \ {
  \   'bufnr': 42,
  \   'vcol': 0,
  \   'nr': -1,
  \   'lnum': 53,
  \   'col': 10,
  \   'type': 'E',
  \   'text': 'if block ends with a return statement, so drop this else and outdent its block (move short variable declaration to its own line if necessary)',
  \ },
  \], g:loclist

Execute (Run HandleUnixFormatAsWarning):
  let g:loclist = ale#handlers#HandleUnixFormatAsWarning(42, [
  \ 'file.go:27: missing argument for Printf("%s"): format reads arg 2, have only 1 args',
  \ 'file.go:53:10: if block ends with a return statement, so drop this else and outdent its block (move short variable declaration to its own line if necessary)',
  \])

Then (The loclist should be correct):
  AssertEqual [
  \ {
  \   'bufnr': 42,
  \   'vcol': 0,
  \   'nr': -1,
  \   'lnum': 27,
  \   'col': 0,
  \   'type': 'W',
  \   'text': 'missing argument for Printf("%s"): format reads arg 2, have only 1 args',
  \ },
  \ {
  \   'bufnr': 42,
  \   'vcol': 0,
  \   'nr': -1,
  \   'lnum': 53,
  \   'col': 10,
  \   'type': 'W',
  \   'text': 'if block ends with a return statement, so drop this else and outdent its block (move short variable declaration to its own line if necessary)',
  \ },
  \], g:loclist

Execute (Run a Unix format function with a Windows path):
  let g:loclist = ale#handlers#HandleUnixFormatAsError(42, [
  \ 'C:\Users\w0rp\AppData\Local\Temp\Xyz123.go:27: foo',
  \ 'C:\Users\w0rp\AppData\Local\Temp\Xyz123.go:53:10: foo',
  \])

Then (The loclist should be correct):
  AssertEqual [
  \ {
  \   'bufnr': 42,
  \   'vcol': 0,
  \   'nr': -1,
  \   'lnum': 27,
  \   'col': 0,
  \   'type': 'E',
  \   'text': 'foo',
  \ },
  \ {
  \   'bufnr': 42,
  \   'vcol': 0,
  \   'nr': -1,
  \   'lnum': 53,
  \   'col': 10,
  \   'type': 'E',
  \   'text': 'foo',
  \ },
  \], g:loclist

After:
  unlet g:loclist