text: from pre_commit_hooks import check_byte_order_marker
  
  
  def test_failure(tmpdir):
      f = tmpdir.join('f.txt')
      f.write_text('ohai', encoding='utf-8-sig')
      assert check_byte_order_marker.main((f.strpath,)) == 1
  
  
  def test_success(tmpdir):
      f = tmpdir.join('f.txt')
      f.write_text('ohai', encoding='utf-8')
      assert check_byte_order_marker.main((f.strpath,)) == 0
  