pypy/module/_io/test/test_bufferedio.py::AppTestBufferedReader::()::test_bufio_write_through

self = <pypy.interpreter.typedef.W_ObjectObjectUserDictWeakrefable object at 0x00000001229c8138>

    def test_bufio_write_through(self):
            import _io as io
            # Issue #21396: write_through=True doesn't force a flush()
            # on the underlying binary buffered object.
            flush_called, write_called = [], []
            class BufferedWriter(io.BufferedWriter):
                def flush(self, *args, **kwargs):
                    flush_called.append(True)
                    return super().flush(*args, **kwargs)
                def write(self, *args, **kwargs):
                    write_called.append(True)
                    return super().write(*args, **kwargs)
    
            rawio = io.BytesIO()
            data = b"a"
            bufio = BufferedWriter(rawio, len(data)*2)
>           textio = io.TextIOWrapper(bufio, encoding='ascii',
                                      write_through=True)

[/Users/matti/build-worker-arm64/own-macos-arm64/build/pypy/module/_io/test/test_bufferedio.py:380]:17: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

    """ Standard "encodings" Package
    
        Standard Python encoding modules are stored in this package
        directory.
    
        Codec modules must have names corresponding to normalized encoding
        names as defined in the normalize_encoding() function below, e.g.
        'utf-8' must be implemented by the module 'utf_8.py'.
    
        Each codec module must export the following interface:
    
        * getregentry() -> codecs.CodecInfo object
        The getregentry() API must return a CodecInfo object with encoder, decoder,
        incrementalencoder, incrementaldecoder, streamwriter and streamreader
        attributes which adhere to the Python Codec Interface Standard.
    
        In addition, a module may optionally also define the following
        APIs which are then used by the package's codec search function:
    
        * getaliases() -> sequence of encoding name strings to use as aliases
    
        Alias names returned by getaliases() must be normalized encoding
        names as defined by normalize_encoding().
    
    Written by Marc-Andre Lemburg (mal@lemburg.com).
    
    (c) Copyright CNRI, All Rights Reserved. NO WARRANTY.
    
    """#"
    
    import codecs
    import sys
>   from . import aliases
E   (application-level) LookupError: unknown encoding: utf-8

../lib-python/3/encodings/__init__.py:33: LookupError

builder: own-macos-arm64 build #1354+

test: pypy/module/_io/test/test_bufferedio.py::AppTestBufferedReader::()::test_bufio_write_through