Function test_bytesiocopy_flush_propagates

tests/test_stream_lifecycle.py:175–181

``BytesIOCopy.flush()`` also flushes ``copy_to``.

()

def test_bytesiocopy_flush_propagates():
    """``BytesIOCopy.flush()`` also flushes ``copy_to``."""
    target = io.BytesIO()
    copier = BytesIOCopy(copy_to=target)
    copier.write(b"abc")
    copier.flush()
    assert target.getvalue() == b"abc"


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