Test chess.engine under Cygwin

[niklasf]

Bug report received via email:

import chess
import chess.engine
import logging
import asyncio

logging.basicConfig(level=logging.DEBUG)
engine = chess.engine.SimpleEngine.popen_uci("stockfish") # ./stockfish15.exe")
board = chess.Board("r1bqkbnr/p1pp1ppp/1pn5/4p3/2B1P3/5Q2/PPPP1PPP/RNB1K1NR w KQkq - 2 4")
info = engine.analyse(board, chess.engine.Limit(depth=20))
print("Score:", info["score"])

DEBUG:asyncio:Using selector: PollSelector
DEBUG:chess.engine:Using PollingChildWatcher
DEBUG:chess.engine:<UciProtocol (pid=1560)>: Connection made
DEBUG:chess.engine:<UciProtocol (pid=1560)>: << uci
DEBUG:chess.engine:<UciProtocol (pid=1560)>: >> Stockfish 15 by the Stockfish developers (see AUTHORS file)
DEBUG:chess.engine:<UciProtocol (pid=1560)>: Process exited
DEBUG:chess.engine:<UciProtocol (pid=1560)>: Connection lost (exit code: 0, error: None)
Traceback (most recent call last):
  File "/home/user/chess/repro.py", line 7, in <module>
    engine = chess.engine.SimpleEngine.popen_uci("./stockfish15.exe")
  File "/usr/local/lib/python3.9/site-packages/chess/engine.py", line 3054, in popen_uci
    return cls.popen(UciProtocol, command, timeout=timeout, debug=debug, setpgrp=setpgrp, **popen_args)
  File "/usr/local/lib/python3.9/site-packages/chess/engine.py", line 3046, in popen
    return run_in_background(background, name=f"{cls.__name__} (command={command!r})", debug=debug)
  File "/usr/local/lib/python3.9/site-packages/chess/engine.py", line 201, in run_in_background
    return future.result()
  File "/usr/lib/python3.9/concurrent/futures/_base.py", line 446, in result
    return self.__get_result()
  File "/usr/lib/python3.9/concurrent/futures/_base.py", line 391, in __get_result
    raise self._exception
  File "/usr/local/lib/python3.9/site-packages/chess/engine.py", line 195, in background
    asyncio.run(coroutine(future))
  File "/usr/lib/python3.9/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/lib/python3.9/asyncio/base_events.py", line 647, in run_until_complete
    return future.result()
  File "/usr/local/lib/python3.9/site-packages/chess/engine.py", line 3038, in background
    await asyncio.wait_for(protocol.initialize(), timeout)
  File "/usr/lib/python3.9/asyncio/tasks.py", line 479, in wait_for
    return fut.result()
  File "/usr/local/lib/python3.9/site-packages/chess/engine.py", line 1510, in initialize
    return await self.communicate(UciInitializeCommand)
  File "/usr/local/lib/python3.9/site-packages/chess/engine.py", line 1133, in communicate
    return await command.result
chess.engine.EngineTerminatedError: engine process died unexpectedly (exit code: 0)