/usr/lib/python3/dist-packages/tornado/test/asyncio_test.py is in python3-tornado 4.2.1-1ubuntu3.
This file is owned by root:root, with mode 0o644.
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# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from __future__ import absolute_import, division, print_function, with_statement
import sys
import textwrap
from tornado import gen
from tornado.testing import AsyncTestCase, gen_test
from tornado.test.util import unittest
try:
from tornado.platform.asyncio import asyncio, AsyncIOLoop
except ImportError:
asyncio = None
skipIfNoSingleDispatch = unittest.skipIf(
gen.singledispatch is None, "singledispatch module not present")
@unittest.skipIf(asyncio is None, "asyncio module not present")
class AsyncIOLoopTest(AsyncTestCase):
def get_new_ioloop(self):
io_loop = AsyncIOLoop()
asyncio.set_event_loop(io_loop.asyncio_loop)
return io_loop
def test_asyncio_callback(self):
# Basic test that the asyncio loop is set up correctly.
asyncio.get_event_loop().call_soon(self.stop)
self.wait()
@skipIfNoSingleDispatch
@gen_test
def test_asyncio_future(self):
# Test that we can yield an asyncio future from a tornado coroutine.
# Without 'yield from', we must wrap coroutines in asyncio.async.
x = yield asyncio.async(
asyncio.get_event_loop().run_in_executor(None, lambda: 42))
self.assertEqual(x, 42)
@unittest.skipIf(sys.version_info < (3, 3),
'PEP 380 not available')
@skipIfNoSingleDispatch
@gen_test
def test_asyncio_yield_from(self):
# Test that we can use asyncio coroutines with 'yield from'
# instead of asyncio.async(). This requires python 3.3 syntax.
global_namespace = dict(globals(), **locals())
local_namespace = {}
exec(textwrap.dedent("""
@gen.coroutine
def f():
event_loop = asyncio.get_event_loop()
x = yield from event_loop.run_in_executor(None, lambda: 42)
return x
"""), global_namespace, local_namespace)
result = yield local_namespace['f']()
self.assertEqual(result, 42)
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