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"""Tests support for new syntax introduced by PEP 492."""
import collections.abc
import unittest
from test import support
from unittest import mock
import asyncio
from asyncio import test_utils
class BaseTest(test_utils.TestCase):
def setUp(self):
self.loop = asyncio.BaseEventLoop()
self.loop._process_events = mock.Mock()
self.loop._selector = mock.Mock()
self.loop._selector.select.return_value = ()
self.set_event_loop(self.loop)
class LockTests(BaseTest):
def test_context_manager_async_with(self):
primitives = [
asyncio.Lock(loop=self.loop),
asyncio.Condition(loop=self.loop),
asyncio.Semaphore(loop=self.loop),
asyncio.BoundedSemaphore(loop=self.loop),
]
async def test(lock):
await asyncio.sleep(0.01, loop=self.loop)
self.assertFalse(lock.locked())
async with lock as _lock:
self.assertIs(_lock, None)
self.assertTrue(lock.locked())
await asyncio.sleep(0.01, loop=self.loop)
self.assertTrue(lock.locked())
self.assertFalse(lock.locked())
for primitive in primitives:
self.loop.run_until_complete(test(primitive))
self.assertFalse(primitive.locked())
def test_context_manager_with_await(self):
primitives = [
asyncio.Lock(loop=self.loop),
asyncio.Condition(loop=self.loop),
asyncio.Semaphore(loop=self.loop),
asyncio.BoundedSemaphore(loop=self.loop),
]
async def test(lock):
await asyncio.sleep(0.01, loop=self.loop)
self.assertFalse(lock.locked())
with await lock as _lock:
self.assertIs(_lock, None)
self.assertTrue(lock.locked())
await asyncio.sleep(0.01, loop=self.loop)
self.assertTrue(lock.locked())
self.assertFalse(lock.locked())
for primitive in primitives:
self.loop.run_until_complete(test(primitive))
self.assertFalse(primitive.locked())
class StreamReaderTests(BaseTest):
def test_readline(self):
DATA = b'line1\nline2\nline3'
stream = asyncio.StreamReader(loop=self.loop)
stream.feed_data(DATA)
stream.feed_eof()
async def reader():
data = []
async for line in stream:
data.append(line)
return data
data = self.loop.run_until_complete(reader())
self.assertEqual(data, [b'line1\n', b'line2\n', b'line3'])
class CoroutineTests(BaseTest):
def test_iscoroutine(self):
async def foo(): pass
f = foo()
try:
self.assertTrue(asyncio.iscoroutine(f))
finally:
f.close() # silence warning
class FakeCoro(collections.abc.Coroutine):
def send(self, value): pass
def throw(self, typ, val=None, tb=None): pass
fc = FakeCoro()
try:
self.assertTrue(asyncio.iscoroutine(fc))
finally:
# To make sure that ABCMeta caches are freed
# from FakeCoro ASAP.
fc = FakeCoro = None
support.gc_collect()
if __name__ == '__main__':
unittest.main()
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