Before:
  runtime ale_linters/javascript/jscs.vim

After:
  call ale#linter#Reset()
  let g:ale_javascript_jscs_executable = 'jscs'

Execute(Should return the correct default values):
  AssertEqual
  \  'jscs',
  \   ale_linters#javascript#jscs#GetExecutable(bufnr(''))
  AssertEqual
  \   '''jscs'' --reporter inline --no-colors -',
  \   ale_linters#javascript#jscs#GetCommand(bufnr(''))


Execute(Should allow using a custom executable):
  let g:ale_javascript_jscs_executable = 'foobar'

  AssertEqual
  \   'foobar',
  \   ale_linters#javascript#jscs#GetExecutable(bufnr(''))
  AssertEqual
  \   '''foobar'' --reporter inline --no-colors -',
  \   ale_linters#javascript#jscs#GetCommand(bufnr(''))