Before:
  Save g:ale_rust_rls_executable

  unlet! g:ale_rust_rls_executable

  runtime ale_linters/rust/rls.vim

  call ale#test#SetDirectory('/testplugin/test/command_callback')

After:
  Restore

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

Execute(The default executable path should be correct):
  AssertEqual 'rls', ale_linters#rust#rls#GetExecutable(bufnr(''))
  AssertEqual
  \ ale#Escape('rls') . ' +nightly',
  \ ale_linters#rust#rls#GetCommand(bufnr(''))

Execute(The language string should be correct):
  AssertEqual 'rust', ale_linters#rust#rls#GetLanguage(bufnr(''))

Execute(The project root should be detected correctly):
  AssertEqual '', ale_linters#rust#rls#GetProjectRoot(bufnr(''))

  call ale#test#SetFilename('rust-rls-project/test.rs')

  AssertEqual
  \ ale#path#Winify(g:dir . '/rust-rls-project'),
  \ ale_linters#rust#rls#GetProjectRoot(bufnr(''))