Before:
  let b:file = fnamemodify(bufname(''), ':.')
  call ale#assert#SetUpLinterTest('erlang', 'elvis')

After:
  call ale#assert#TearDownLinterTest()

Execute(Default command should be correct):
  AssertLinter 'elvis',
  \ ale#Escape('elvis') . ' rock --output-format=parsable ' . ale#Escape(b:file)

Execute(Executable should be configurable):
  let b:ale_erlang_elvis_executable = '/path/to/elvis'

  AssertLinter '/path/to/elvis',
  \ ale#Escape('/path/to/elvis') . ' rock --output-format=parsable ' . ale#Escape(b:file)