ipykernel
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Fix test_outstream
test_outstream passes but it shouldn't, here is what is printed if pytest -s is used:
Traceback (most recent call last):
File "/home/runner/work/ipykernel/ipykernel/ipykernel/iostream.py", line 392, in _watch_pipe_fd
bts = os.read(self._fid, PIPE_BUFFER_SIZE)
AttributeError: 'OutStream' object has no attribute '_fid'