test_subprocess_pipe fails with ProcessLookupError

[socram8888]

Steps to reproduce

1. Install a dev setup as specified in CONTRIBUTING.rst

2. Run make test

Expected behaviour

Tests should pass

Actual behaviour

test_subprocess_pipe fails with ProcessLookupError. The process finishes before the os.kill call is made, and thus the exception is being raised.

Configuration

Operating System: Ubuntu 16.04 on Windows 10

Version of Python, python-telegram-bot & dependencies: Python 3.5.2, bot on commit 42daf96 (latest available)

Logs

____________________________________________________________________________________________________ TestInputFile.test_subprocess_pipe _____________________________________________________________________________________________________

self = <tests.test_inputfile.TestInputFile object at 0x7ff6fce846a0>

    def test_subprocess_pipe(self):
        if sys.platform == 'win32':
            cmd = ['type', self.png]
        else:
            cmd = ['cat', self.png]

        proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=(sys.platform == 'win32'))
        in_file = InputFile({'photo': proc.stdout})

        assert in_file.input_file_content == open(self.png, 'rb').read()
        assert in_file.mimetype == 'image/png'
        assert in_file.filename == 'image.png'

>       proc.kill()

tests/test_inputfile.py:43:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/usr/lib/python3.5/subprocess.py:1787: in kill
    self.send_signal(signal.SIGKILL)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <subprocess.Popen object at 0x7ff6fce84550>, sig = <Signals.SIGKILL: 9>

    def send_signal(self, sig):
        """Send a signal to the process."""
        # Skip signalling a process that we know has already died.
        if self.returncode is None:
>           os.kill(self.pid, sig)
E           ProcessLookupError: [Errno 3] No such process

/usr/lib/python3.5/subprocess.py:1777: ProcessLookupError```