I am trying to write a test for a function using asyncio. Can I mix using
unittest.TestCase and asyncio.test_utils.TestCase? When I do that, the loop in
test_utils.TestCase seems to affect the other code I have. This is a simplified
example -
$ pip freeze
py==1.4.34
pytest==3.1.2
$ cat test_foo.py
import asyncio
import unittest
from asyncio import test_utils
async def foo():
return True
class Foo1Test(test_utils.TestCase):
def setUp(self):
super().setUp()
self.loop = self.new_test_loop()
self.set_event_loop(self.loop)
def test_foo(self):
res = self.loop.run_until_complete(foo())
assert res is True
class Foo2Test(unittest.TestCase):
def test_foo(self):
loop = asyncio.get_event_loop()
res = loop.run_until_complete(foo())
assert res is True
class Foo3Test(test_utils.TestCase):
def setUp(self):
super().setUp()
self.loop = self.new_test_loop()
self.set_event_loop(self.loop)
def test_foo(self):
res = self.loop.run_until_complete(foo())
assert res is True
$ py.test -v
==============================================================================
test session starts
===============================================================================
platform darwin -- Python 3.6.1, pytest-3.1.2, py-1.4.34, pluggy-0.4.0 --
/private/tmp/foobar/.env/bin/python3
cachedir: .cache
rootdir: /private/tmp/foobar, inifile:
collected 3 items
test_foo.py::Foo1Test::test_foo PASSED
test_foo.py::Foo2Test::test_foo FAILED
test_foo.py::Foo3Test::test_foo PASSED
====================================================================================
FAILURES
====================================================================================
_______________________________________________________________________________
Foo2Test.test_foo
________________________________________________________________________________
self = <test_foo.Foo2Test testMethod=test_foo>
def test_foo(self):
> loop = asyncio.get_event_loop()
test_foo.py:26:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _
/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/events.py:678:
in get_event_loop
return get_event_loop_policy().get_event_loop()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _
self = <asyncio.unix_events._UnixDefaultEventLoopPolicy object at 0x11053ffd0>
def get_event_loop(self):
"""Get the event loop.
This may be None or an instance of EventLoop.
"""
if (self._local._loop is None and
not self._local._set_called and
isinstance(threading.current_thread(), threading._MainThread)):
self.set_event_loop(self.new_event_loop())
if self._local._loop is None:
raise RuntimeError('There is no current event loop in thread %r.'
> % threading.current_thread().name)
E RuntimeError: There is no current event loop in thread 'MainThread'.
/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/events.py:584:
RuntimeError
What am I missing?
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