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"""Tests support for new syntax introduced by PEP 492."""
import sys
import types
import unittest
from unittest import mock
import asyncio
from test.test_asyncio import utils as test_utils
def tearDownModule():
asyncio.set_event_loop_policy(None)
# Test that asyncio.iscoroutine() uses collections.abc.Coroutine
class FakeCoro:
def send(self, value):
pass
def throw(self, typ, val=None, tb=None):
pass
def close(self):
pass
def __await__(self):
yield
class BaseTest(test_utils.TestCase):
def setUp(self):
super().setUp()
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(),
asyncio.Condition(),
asyncio.Semaphore(),
asyncio.BoundedSemaphore(),
]
async def test(lock):
await asyncio.sleep(0.01)
self.assertFalse(lock.locked())
async with lock as _lock:
self.assertIs(_lock, None)
self.assertTrue(lock.locked())
await asyncio.sleep(0.01)
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(),
asyncio.Condition(),
asyncio.Semaphore(),
asyncio.BoundedSemaphore(),
]
async def test(lock):
await asyncio.sleep(0.01)
self.assertFalse(lock.locked())
with self.assertRaisesRegex(
TypeError,
"can't be used in 'await' expression"
):
with await lock:
pass
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
self.assertTrue(asyncio.iscoroutine(FakeCoro()))
def test_iscoroutine_generator(self):
def foo(): yield
self.assertFalse(asyncio.iscoroutine(foo()))
def test_iscoroutinefunction(self):
async def foo(): pass
self.assertTrue(asyncio.iscoroutinefunction(foo))
def test_async_def_coroutines(self):
async def bar():
return 'spam'
async def foo():
return await bar()
# production mode
data = self.loop.run_until_complete(foo())
self.assertEqual(data, 'spam')
# debug mode
self.loop.set_debug(True)
data = self.loop.run_until_complete(foo())
self.assertEqual(data, 'spam')
def test_debug_mode_manages_coroutine_origin_tracking(self):
async def start():
self.assertTrue(sys.get_coroutine_origin_tracking_depth() > 0)
self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 0)
self.loop.set_debug(True)
self.loop.run_until_complete(start())
self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 0)
def test_types_coroutine(self):
def gen():
yield from ()
return 'spam'
@types.coroutine
def func():
return gen()
async def coro():
wrapper = func()
self.assertIsInstance(wrapper, types._GeneratorWrapper)
return await wrapper
data = self.loop.run_until_complete(coro())
self.assertEqual(data, 'spam')
def test_task_print_stack(self):
T = None
async def foo():
f = T.get_stack(limit=1)
try:
self.assertEqual(f[0].f_code.co_name, 'foo')
finally:
f = None
async def runner():
nonlocal T
T = asyncio.ensure_future(foo(), loop=self.loop)
await T
self.loop.run_until_complete(runner())
def test_double_await(self):
async def afunc():
await asyncio.sleep(0.1)
async def runner():
coro = afunc()
t = self.loop.create_task(coro)
try:
await asyncio.sleep(0)
await coro
finally:
t.cancel()
self.loop.set_debug(True)
with self.assertRaises(
RuntimeError,
msg='coroutine is being awaited already'):
self.loop.run_until_complete(runner())
if __name__ == '__main__':
unittest.main()
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