Before:
  call ale#assert#SetUpLinterTest('nix', 'statix')

After:
  call ale#assert#TearDownLinterTest()

Execute(The default statix command should be correct):
  AssertLinter 'statix', ale#Escape('statix') . ' check -o errfmt --stdin'

Execute(The statix executable and options should be configurable):
  let g:ale_nix_statix_check_executable = 'foo'
  let g:ale_nix_statix_check_options = '--foobar'

  AssertLinter 'foo', ale#Escape('foo') . ' check -o errfmt --stdin --foobar'