Before:
  Save g:ale_ruby_rubocop_executable

  let g:ale_ruby_rubocop_executable = 'rubocop'

  runtime ale_linters/ruby/rubocop.vim
  call ale#test#SetDirectory('/testplugin/test/command_callback')
  call ale#test#SetFilename('dummy.rb')

After:
  Restore

  call ale#linter#Reset()
  call ale#test#RestoreDirectory()

Execute(Executable should default to rubocop):
  AssertEqual
  \ ale#Escape('rubocop')
  \   . ' --format json --force-exclusion  --stdin '
  \   . ale#Escape(ale#path#Simplify(g:dir . '/dummy.rb')),
  \ ale_linters#ruby#rubocop#GetCommand(bufnr(''))

Execute(Should be able to set a custom executable):
  let g:ale_ruby_rubocop_executable = 'bin/rubocop'

  AssertEqual
  \ ale#Escape('bin/rubocop')
  \   . ' --format json --force-exclusion  --stdin '
  \   . ale#Escape(ale#path#Simplify(g:dir . '/dummy.rb')),
  \ ale_linters#ruby#rubocop#GetCommand(bufnr(''))

Execute(Setting bundle appends 'exec rubocop'):
  let g:ale_ruby_rubocop_executable = 'path to/bundle'

  AssertEqual
  \ ale#Escape('path to/bundle') . ' exec rubocop'
  \   . ' --format json --force-exclusion  --stdin '
  \   . ale#Escape(ale#path#Simplify(g:dir . '/dummy.rb')),
  \ ale_linters#ruby#rubocop#GetCommand(bufnr(''))