`test_file` failed on Windows with a longer repo path in `test_urllib2`

On Windows, when the CPython repository is cloned to a slightly longer path, for example, C:\Users\xxxxx\Source\cpython — this test case will fail:

ERROR: test_file (test.test_urllib2.HandlerTests.test_file)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Users\xxxxx\Source\cpython\Lib\encodings\idna.py", line 219, in encode
    result.extend(ToASCII(label))
                  ~~~~~~~^^^^^^^
  File "C:\Users\xxxxx\Source\cpython\Lib\encodings\idna.py", line 115, in ToASCII
    raise UnicodeEncodeError("idna", label, 0, len(label), "label too long")
UnicodeEncodeError: 'idna' codec can't encode characters in position 0-64: label too long

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\xxxxx\Source\cpython\Lib\test\test_urllib2.py", line 872, in test_file
    self.assertRaises(urllib.error.URLError,
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
                      h.file_open, Request(url))
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\xxxxx\Source\cpython\Lib\unittest\case.py", line 813, in assertRaises
    return context.handle('assertRaises', args, kwargs)
           ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\xxxxx\Source\cpython\Lib\unittest\case.py", line 247, in handle
    callable_obj(*args, **kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "C:\Users\xxxxx\Source\cpython\Lib\urllib\request.py", line 1469, in open_local_file
    localfile = url2pathname(req.full_url, require_scheme=True)
  File "C:\Users\xxxxx\Source\cpython\Lib\urllib\request.py", line 1658, in url2pathname
    if not _is_local_authority(authority):
           ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
  File "C:\Users\xxxxx\Source\cpython\Lib\urllib\request.py", line 1498, in _is_local_authority
    address = socket.gethostbyname(authority)
  File "C:\Users\xxxxx\Source\cpython\Lib\encodings\idna.py", line 222, in encode
    raise UnicodeEncodeError(
    ...<5 lines>...
    )
UnicodeEncodeError: 'idna' codec can't encode characters in position 8-72: label too long
encoding with 'idna' codec failed

See:
https://github.com/python/cpython/blob/c336f1c3126203fd6c38050df94e9fe8c0d7f2e2/Lib/test/test_urllib2.py#L857-L860

These two URLs will become:

• file://127.0.0.1:80C:\Users\xxxxx\Source\cpython\build\test_python_worker_17208æ/@test_17208_tmpæ
• file://somerandomhost.ontheinternet.comC:\Users\xxxxx\Source\cpython\build\test_python_worker_4676æ/@test_4676_tmpæ

Here, 127.0.0.1:80C:\Users\xxxxx\Source\cpython\build\test_python_worker_17208æ is treated as the domain and passed to socket.gethostbyname. However, the part 1:80C:\Users\xxxxx\Source\cpython\build\test_python_worker_17208æ is too long to be a valid domain label. As a result, the idna codec raises an exception, indicating the label is too long.

A patch is on the way.

Linked PRs

• gh-133449

Bắt đầu trong Lib/test/test_urllib2.py, tại khu vực quanh test_file, đặc biệt là phần thiết lập URL gần các dòng 857-860 và assertion gần dòng 872. Chạy test.test_urllib2.HandlerTests.test_file trên Windows với đường dẫn checkout dài hơn và so sánh URL cùng exception thu được. Hoàn tất khi test không còn thất bại trong môi trường đó mà vẫn giữ assertion URLError như dự định.