ale/test/command_callback/test_rustc_command_callback.vader

Before:
  call ale#assert#SetUpLinterTest('rust', 'rustc')

After:
  call ale#assert#TearDownLinterTest()

Execute(The default command should be correct):
  AssertLinter 'rustc', 'rustc --error-format=json -Z no-trans -'

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

  AssertLinter 'rustc', 'rustc --error-format=json --foo -'

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

  AssertLinter 'rustc', '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'))
  \   . ' -'