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from asyncio import subprocess
import asyncio
import os
import sys
import unittest
class SubprocessTestCase(unittest.TestCase):
def setUp(self):
policy = asyncio.get_event_loop_policy()
if os.name == 'nt':
self.loop = asyncio.ProactorEventLoop()
else:
self.loop = policy.new_event_loop()
# ensure that the event loop is passed explicitly in the code
policy.set_event_loop(None)
def tearDown(self):
policy = asyncio.get_event_loop_policy()
self.loop.close()
policy.set_child_watcher(None)
def test_call(self):
args = [sys.executable, '-c', 'pass']
@asyncio.coroutine
def run():
return (yield from subprocess.call(*args, loop=self.loop))
exitcode = self.loop.run_until_complete(run())
self.assertEqual(exitcode, 0)
def test_stdin_stdout(self):
code = '; '.join((
'import sys',
'data = sys.stdin.buffer.read()',
'sys.stdout.buffer.write(data)',
))
args = [sys.executable, '-c', code]
@asyncio.coroutine
def run(data):
proc = yield from asyncio.create_subprocess_exec(
*args,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
loop=self.loop)
# feed data
proc.stdin.write(data)
yield from proc.stdin.drain()
proc.stdin.close()
# get output and exitcode
data = yield from proc.stdout.read()
exitcode = yield from proc.wait()
return (exitcode, data)
task = run(b'some data')
task = asyncio.wait_for(task, 10.0, loop=self.loop)
exitcode, stdout = self.loop.run_until_complete(task)
self.assertEqual(exitcode, 0)
self.assertEqual(stdout, b'some data')
if __name__ == '__main__':
unittest.main()
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