Before:
  call ale#assert#SetUpLinterTest('eruby', 'ruumba')
  call ale#test#SetFilename('dummy.html.erb')

  let g:ale_eruby_ruumba_executable = 'ruumba'
  let g:ale_eruby_ruumba_options = ''

After:
  call ale#assert#TearDownLinterTest()

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

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

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

Execute(Setting bundle appends 'exec ruumba'):
  let g:ale_eruby_ruumba_executable = 'path to/bundle'

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