Execute(prettier-eslint should be aliased):
  AssertEqual 'ale#fixers#prettier_eslint#Fix', ale#fix#registry#GetFunc('prettier-eslint')

Execute(prettier-standard should be aliased):
  AssertEqual 'ale#fixers#prettier_standard#Fix', ale#fix#registry#GetFunc('prettier-standard')

Execute(markdownlint should be aliased to markdownlint-cli):
  AssertEqual
  \ 'ale#fixers#markdownlint#Fix',
  \ ale#fix#registry#GetFunc('markdownlint')

Execute(markdownlint-cli should be available directly):
  AssertEqual
  \ 'ale#fixers#markdownlint#Fix',
  \ ale#fix#registry#GetFunc('markdownlint-cli')

Execute(markdownlint-cli2 should be available directly):
  AssertEqual
  \ 'ale#fixers#markdownlint_cli2#Fix',
  \ ale#fix#registry#GetFunc('markdownlint-cli2')