[Python-modules-team] Bug#945450: python-urllib3: FTBFS under C locale

[Andreas Beckmann]

Source: python-urllib3
Version: 1.25.6-2
Severity: serious
Tags: ftbfs
Justification: fails to build from source

Hi,

python-urllib3/experimental FTBFS under LC_ALL=C (which is set by
pbuilder) due to a failing test. It works if e.g. LC_ALL=C.UTF-8 is
exported from debian/rules.

=================================== FAILURES ===================================
______________________ TestResponse.test_io_textiowrapper ______________________

self = <test.test_response.TestResponse object at 0x7f8836078590>

    def test_io_textiowrapper(self):
        fp = BytesIO(b"\xc3\xa4\xc3\xb6\xc3\xbc\xc3\x9f")
        resp = HTTPResponse(fp, preload_content=False)
        br = TextIOWrapper(resp, encoding="utf8")
    
        assert br.read() == u"äöüß"
    
        br.close()
        assert resp.closed
    
        # HTTPResponse.read() by default closes the response
        # https://github.com/urllib3/urllib3/issues/1305
        fp = BytesIO(
            b"\xc3\xa4\xc3\xb6\xc3\xbc\xc3\x9f\n\xce\xb1\xce\xb2\xce\xb3\xce\xb4"
        )
        resp = HTTPResponse(fp, preload_content=False)
        with pytest.raises(ValueError) as ctx:
            if six.PY2:
                # py2's implementation of TextIOWrapper requires `read1`
                # method which is provided by `BufferedReader` wrapper
                resp = BufferedReader(resp)
            list(TextIOWrapper(resp))
>       assert str(ctx.value) == "I/O operation on closed file."
E       assert "'ascii' code...in range(128)" == 'I/O operation on closed file.'
E         - 'ascii' codec can't decode byte 0xc3 in position 0: ordinal not in range(128)
E         + I/O operation on closed file.

test/test_response.py:416: AssertionError
======== 1 failed, 466 passed, 8 skipped, 1 deselected in 12.46 seconds ========


Andreas