Before:
  call ale#assert#SetUpLinterTest('ruby', 'rubocop')
  call ale#test#SetFilename('dummy.rb')

  let g:ale_ruby_rubocop_executable = 'rubocop'
  let g:ale_ruby_rubocop_options = ''

After:
  call ale#assert#TearDownLinterTest()

Execute(Executable should default to rubocop):
  AssertLinter 'rubocop', ale#Escape('rubocop')
  \   . ' --format json --force-exclusion  --stdin %s'

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

  AssertLinter 'bin/rubocop' , ale#Escape('bin/rubocop')
  \   . ' --format json --force-exclusion  --stdin %s'

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

  AssertLinter 'path to/bundle', ale#Escape('path to/bundle')
  \   . ' exec rubocop'
  \   . ' --format json --force-exclusion  --stdin %s'