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我有 ThreadedSimpleServer。现在我想用 unittest 测试它。在 test.py 文件中，我有类 Test(unittest.TestCase)。

if __name__ == '__main__':
# create service
service = Service()

# run service in a separate thread
thread = Thread(target=service.start, name='ServiceThread')
thread.start()

# start testing
unittest.main()

当我运行代码时，其中一项测试发生了管道损坏错误：

File "/usr/lib/python2.7/SocketServer.py", line 323, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/lib/python2.7/SocketServer.py", line 640, in __init__
self.finish()
File "/usr/lib/python2.7/SocketServer.py", line 693, in finish
self.wfile.flush()
File "/usr/lib/python2.7/socket.py", line 303, in flush
self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 32] Broken pipe

如果我从一个地方运行服务器，并从另一个地方执行 unittest，则没有错误。在整个过程中，双方的连接都是打开的。问题出在哪里？

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