Before:
  Save g:ale_rust_rustc_options

  unlet! g:ale_rust_rustc_options

  runtime ale_linters/rust/rustc.vim
  call ale#test#SetDirectory('/testplugin/test/command_callback')

After:
  Restore

  unlet! b:ale_rust_rustc_options

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

Execute(The default command should be correct):
  AssertEqual
  \ 'rustc --error-format=json -Z no-trans -',
  \ ale_linters#rust#rustc#RustcCommand(bufnr(''))

Execute(The options should be configurable):
  let b:ale_rust_rustc_options = '--foo'

  AssertEqual
  \ 'rustc --error-format=json --foo -',
  \ ale_linters#rust#rustc#RustcCommand(bufnr(''))

Execute(Some default paths should be included when the project is a Cargo project):
  call ale#test#SetFilename('cargo_paths/test.rs')

  AssertEqual
  \ 'rustc --error-format=json -Z no-trans'
  \   . ' -L ' . ale#Escape(ale#path#GetAbsPath(g:dir,  'cargo_paths/target/debug/deps'))
  \   . ' -L ' . ale#Escape(ale#path#GetAbsPath(g:dir, 'cargo_paths/target/release/deps'))
  \   . ' -',
  \ ale_linters#rust#rustc#RustcCommand(bufnr(''))