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843 lines
24 KiB
Python
843 lines
24 KiB
Python
"""Tests for lock.py"""
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import unittest
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from unittest import mock
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import re
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import asyncio
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from asyncio import test_utils
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STR_RGX_REPR = (
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r'^<(?P<class>.*?) object at (?P<address>.*?)'
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r'\[(?P<extras>'
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r'(set|unset|locked|unlocked)(,value:\d)?(,waiters:\d+)?'
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r')\]>\Z'
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)
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RGX_REPR = re.compile(STR_RGX_REPR)
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class LockTests(test_utils.TestCase):
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def setUp(self):
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self.loop = self.new_test_loop()
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def test_ctor_loop(self):
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loop = mock.Mock()
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lock = asyncio.Lock(loop=loop)
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self.assertIs(lock._loop, loop)
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lock = asyncio.Lock(loop=self.loop)
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self.assertIs(lock._loop, self.loop)
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def test_ctor_noloop(self):
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asyncio.set_event_loop(self.loop)
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lock = asyncio.Lock()
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self.assertIs(lock._loop, self.loop)
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def test_repr(self):
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lock = asyncio.Lock(loop=self.loop)
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self.assertTrue(repr(lock).endswith('[unlocked]>'))
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self.assertTrue(RGX_REPR.match(repr(lock)))
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@asyncio.coroutine
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def acquire_lock():
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yield from lock
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self.loop.run_until_complete(acquire_lock())
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self.assertTrue(repr(lock).endswith('[locked]>'))
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self.assertTrue(RGX_REPR.match(repr(lock)))
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def test_lock(self):
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lock = asyncio.Lock(loop=self.loop)
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@asyncio.coroutine
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def acquire_lock():
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return (yield from lock)
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res = self.loop.run_until_complete(acquire_lock())
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self.assertTrue(res)
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self.assertTrue(lock.locked())
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lock.release()
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self.assertFalse(lock.locked())
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def test_acquire(self):
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lock = asyncio.Lock(loop=self.loop)
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result = []
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self.assertTrue(self.loop.run_until_complete(lock.acquire()))
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@asyncio.coroutine
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def c1(result):
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if (yield from lock.acquire()):
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result.append(1)
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return True
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@asyncio.coroutine
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def c2(result):
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if (yield from lock.acquire()):
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result.append(2)
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return True
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@asyncio.coroutine
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def c3(result):
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if (yield from lock.acquire()):
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result.append(3)
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return True
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t1 = asyncio.Task(c1(result), loop=self.loop)
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t2 = asyncio.Task(c2(result), loop=self.loop)
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test_utils.run_briefly(self.loop)
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self.assertEqual([], result)
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lock.release()
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test_utils.run_briefly(self.loop)
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self.assertEqual([1], result)
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test_utils.run_briefly(self.loop)
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self.assertEqual([1], result)
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t3 = asyncio.Task(c3(result), loop=self.loop)
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lock.release()
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test_utils.run_briefly(self.loop)
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self.assertEqual([1, 2], result)
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lock.release()
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test_utils.run_briefly(self.loop)
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self.assertEqual([1, 2, 3], result)
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self.assertTrue(t1.done())
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self.assertTrue(t1.result())
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self.assertTrue(t2.done())
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self.assertTrue(t2.result())
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self.assertTrue(t3.done())
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self.assertTrue(t3.result())
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def test_acquire_cancel(self):
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lock = asyncio.Lock(loop=self.loop)
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self.assertTrue(self.loop.run_until_complete(lock.acquire()))
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task = asyncio.Task(lock.acquire(), loop=self.loop)
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self.loop.call_soon(task.cancel)
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self.assertRaises(
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asyncio.CancelledError,
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self.loop.run_until_complete, task)
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self.assertFalse(lock._waiters)
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def test_cancel_race(self):
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# Several tasks:
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# - A acquires the lock
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# - B is blocked in aqcuire()
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# - C is blocked in aqcuire()
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#
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# Now, concurrently:
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# - B is cancelled
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# - A releases the lock
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#
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# If B's waiter is marked cancelled but not yet removed from
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# _waiters, A's release() call will crash when trying to set
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# B's waiter; instead, it should move on to C's waiter.
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# Setup: A has the lock, b and c are waiting.
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lock = asyncio.Lock(loop=self.loop)
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@asyncio.coroutine
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def lockit(name, blocker):
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yield from lock.acquire()
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try:
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if blocker is not None:
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yield from blocker
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finally:
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lock.release()
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fa = asyncio.Future(loop=self.loop)
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ta = asyncio.Task(lockit('A', fa), loop=self.loop)
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test_utils.run_briefly(self.loop)
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self.assertTrue(lock.locked())
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tb = asyncio.Task(lockit('B', None), loop=self.loop)
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test_utils.run_briefly(self.loop)
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self.assertEqual(len(lock._waiters), 1)
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tc = asyncio.Task(lockit('C', None), loop=self.loop)
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test_utils.run_briefly(self.loop)
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self.assertEqual(len(lock._waiters), 2)
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# Create the race and check.
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# Without the fix this failed at the last assert.
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fa.set_result(None)
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tb.cancel()
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self.assertTrue(lock._waiters[0].cancelled())
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test_utils.run_briefly(self.loop)
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self.assertFalse(lock.locked())
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self.assertTrue(ta.done())
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self.assertTrue(tb.cancelled())
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self.assertTrue(tc.done())
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def test_release_not_acquired(self):
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lock = asyncio.Lock(loop=self.loop)
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self.assertRaises(RuntimeError, lock.release)
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def test_release_no_waiters(self):
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lock = asyncio.Lock(loop=self.loop)
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self.loop.run_until_complete(lock.acquire())
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self.assertTrue(lock.locked())
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lock.release()
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self.assertFalse(lock.locked())
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def test_context_manager(self):
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lock = asyncio.Lock(loop=self.loop)
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@asyncio.coroutine
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def acquire_lock():
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return (yield from lock)
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with self.loop.run_until_complete(acquire_lock()):
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self.assertTrue(lock.locked())
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self.assertFalse(lock.locked())
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def test_context_manager_cant_reuse(self):
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lock = asyncio.Lock(loop=self.loop)
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@asyncio.coroutine
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def acquire_lock():
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return (yield from lock)
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# This spells "yield from lock" outside a generator.
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cm = self.loop.run_until_complete(acquire_lock())
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with cm:
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self.assertTrue(lock.locked())
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self.assertFalse(lock.locked())
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with self.assertRaises(AttributeError):
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with cm:
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pass
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def test_context_manager_no_yield(self):
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lock = asyncio.Lock(loop=self.loop)
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try:
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with lock:
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self.fail('RuntimeError is not raised in with expression')
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except RuntimeError as err:
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self.assertEqual(
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str(err),
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'"yield from" should be used as context manager expression')
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self.assertFalse(lock.locked())
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class EventTests(test_utils.TestCase):
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def setUp(self):
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self.loop = self.new_test_loop()
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def test_ctor_loop(self):
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loop = mock.Mock()
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ev = asyncio.Event(loop=loop)
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self.assertIs(ev._loop, loop)
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ev = asyncio.Event(loop=self.loop)
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self.assertIs(ev._loop, self.loop)
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def test_ctor_noloop(self):
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asyncio.set_event_loop(self.loop)
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ev = asyncio.Event()
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self.assertIs(ev._loop, self.loop)
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def test_repr(self):
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ev = asyncio.Event(loop=self.loop)
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self.assertTrue(repr(ev).endswith('[unset]>'))
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match = RGX_REPR.match(repr(ev))
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self.assertEqual(match.group('extras'), 'unset')
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ev.set()
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self.assertTrue(repr(ev).endswith('[set]>'))
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self.assertTrue(RGX_REPR.match(repr(ev)))
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ev._waiters.append(mock.Mock())
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self.assertTrue('waiters:1' in repr(ev))
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self.assertTrue(RGX_REPR.match(repr(ev)))
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def test_wait(self):
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ev = asyncio.Event(loop=self.loop)
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self.assertFalse(ev.is_set())
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result = []
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@asyncio.coroutine
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def c1(result):
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if (yield from ev.wait()):
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result.append(1)
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@asyncio.coroutine
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def c2(result):
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if (yield from ev.wait()):
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result.append(2)
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@asyncio.coroutine
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def c3(result):
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if (yield from ev.wait()):
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result.append(3)
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t1 = asyncio.Task(c1(result), loop=self.loop)
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t2 = asyncio.Task(c2(result), loop=self.loop)
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test_utils.run_briefly(self.loop)
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self.assertEqual([], result)
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t3 = asyncio.Task(c3(result), loop=self.loop)
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ev.set()
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test_utils.run_briefly(self.loop)
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self.assertEqual([3, 1, 2], result)
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self.assertTrue(t1.done())
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self.assertIsNone(t1.result())
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self.assertTrue(t2.done())
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self.assertIsNone(t2.result())
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self.assertTrue(t3.done())
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self.assertIsNone(t3.result())
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def test_wait_on_set(self):
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ev = asyncio.Event(loop=self.loop)
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ev.set()
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res = self.loop.run_until_complete(ev.wait())
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self.assertTrue(res)
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def test_wait_cancel(self):
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ev = asyncio.Event(loop=self.loop)
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wait = asyncio.Task(ev.wait(), loop=self.loop)
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self.loop.call_soon(wait.cancel)
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self.assertRaises(
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asyncio.CancelledError,
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self.loop.run_until_complete, wait)
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self.assertFalse(ev._waiters)
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def test_clear(self):
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ev = asyncio.Event(loop=self.loop)
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self.assertFalse(ev.is_set())
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ev.set()
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self.assertTrue(ev.is_set())
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ev.clear()
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self.assertFalse(ev.is_set())
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def test_clear_with_waiters(self):
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ev = asyncio.Event(loop=self.loop)
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result = []
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@asyncio.coroutine
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def c1(result):
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if (yield from ev.wait()):
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result.append(1)
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return True
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t = asyncio.Task(c1(result), loop=self.loop)
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test_utils.run_briefly(self.loop)
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self.assertEqual([], result)
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ev.set()
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ev.clear()
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self.assertFalse(ev.is_set())
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ev.set()
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ev.set()
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self.assertEqual(1, len(ev._waiters))
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test_utils.run_briefly(self.loop)
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self.assertEqual([1], result)
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self.assertEqual(0, len(ev._waiters))
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self.assertTrue(t.done())
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self.assertTrue(t.result())
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class ConditionTests(test_utils.TestCase):
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def setUp(self):
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self.loop = self.new_test_loop()
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def test_ctor_loop(self):
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loop = mock.Mock()
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cond = asyncio.Condition(loop=loop)
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self.assertIs(cond._loop, loop)
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cond = asyncio.Condition(loop=self.loop)
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self.assertIs(cond._loop, self.loop)
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def test_ctor_noloop(self):
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asyncio.set_event_loop(self.loop)
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cond = asyncio.Condition()
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self.assertIs(cond._loop, self.loop)
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def test_wait(self):
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cond = asyncio.Condition(loop=self.loop)
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result = []
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@asyncio.coroutine
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def c1(result):
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yield from cond.acquire()
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if (yield from cond.wait()):
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result.append(1)
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return True
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@asyncio.coroutine
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def c2(result):
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yield from cond.acquire()
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if (yield from cond.wait()):
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result.append(2)
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return True
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@asyncio.coroutine
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def c3(result):
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yield from cond.acquire()
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if (yield from cond.wait()):
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result.append(3)
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return True
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t1 = asyncio.Task(c1(result), loop=self.loop)
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t2 = asyncio.Task(c2(result), loop=self.loop)
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t3 = asyncio.Task(c3(result), loop=self.loop)
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test_utils.run_briefly(self.loop)
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self.assertEqual([], result)
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self.assertFalse(cond.locked())
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self.assertTrue(self.loop.run_until_complete(cond.acquire()))
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cond.notify()
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test_utils.run_briefly(self.loop)
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self.assertEqual([], result)
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self.assertTrue(cond.locked())
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cond.release()
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test_utils.run_briefly(self.loop)
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self.assertEqual([1], result)
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self.assertTrue(cond.locked())
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cond.notify(2)
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test_utils.run_briefly(self.loop)
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self.assertEqual([1], result)
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self.assertTrue(cond.locked())
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cond.release()
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test_utils.run_briefly(self.loop)
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self.assertEqual([1, 2], result)
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self.assertTrue(cond.locked())
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cond.release()
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test_utils.run_briefly(self.loop)
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self.assertEqual([1, 2, 3], result)
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self.assertTrue(cond.locked())
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self.assertTrue(t1.done())
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self.assertTrue(t1.result())
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self.assertTrue(t2.done())
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self.assertTrue(t2.result())
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self.assertTrue(t3.done())
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self.assertTrue(t3.result())
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def test_wait_cancel(self):
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cond = asyncio.Condition(loop=self.loop)
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self.loop.run_until_complete(cond.acquire())
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wait = asyncio.Task(cond.wait(), loop=self.loop)
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self.loop.call_soon(wait.cancel)
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self.assertRaises(
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asyncio.CancelledError,
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self.loop.run_until_complete, wait)
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self.assertFalse(cond._waiters)
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self.assertTrue(cond.locked())
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def test_wait_unacquired(self):
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cond = asyncio.Condition(loop=self.loop)
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self.assertRaises(
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RuntimeError,
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self.loop.run_until_complete, cond.wait())
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def test_wait_for(self):
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cond = asyncio.Condition(loop=self.loop)
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presult = False
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def predicate():
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return presult
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result = []
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@asyncio.coroutine
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def c1(result):
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yield from cond.acquire()
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if (yield from cond.wait_for(predicate)):
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result.append(1)
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cond.release()
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return True
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t = asyncio.Task(c1(result), loop=self.loop)
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test_utils.run_briefly(self.loop)
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self.assertEqual([], result)
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self.loop.run_until_complete(cond.acquire())
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cond.notify()
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cond.release()
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test_utils.run_briefly(self.loop)
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self.assertEqual([], result)
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presult = True
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self.loop.run_until_complete(cond.acquire())
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cond.notify()
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cond.release()
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test_utils.run_briefly(self.loop)
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self.assertEqual([1], result)
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self.assertTrue(t.done())
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self.assertTrue(t.result())
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def test_wait_for_unacquired(self):
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cond = asyncio.Condition(loop=self.loop)
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# predicate can return true immediately
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res = self.loop.run_until_complete(cond.wait_for(lambda: [1, 2, 3]))
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self.assertEqual([1, 2, 3], res)
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self.assertRaises(
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RuntimeError,
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self.loop.run_until_complete,
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cond.wait_for(lambda: False))
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def test_notify(self):
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cond = asyncio.Condition(loop=self.loop)
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result = []
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@asyncio.coroutine
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def c1(result):
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yield from cond.acquire()
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if (yield from cond.wait()):
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result.append(1)
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cond.release()
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return True
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@asyncio.coroutine
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def c2(result):
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yield from cond.acquire()
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if (yield from cond.wait()):
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result.append(2)
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cond.release()
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return True
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@asyncio.coroutine
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def c3(result):
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yield from cond.acquire()
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if (yield from cond.wait()):
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result.append(3)
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cond.release()
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return True
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t1 = asyncio.Task(c1(result), loop=self.loop)
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t2 = asyncio.Task(c2(result), loop=self.loop)
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t3 = asyncio.Task(c3(result), loop=self.loop)
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test_utils.run_briefly(self.loop)
|
|
self.assertEqual([], result)
|
|
|
|
self.loop.run_until_complete(cond.acquire())
|
|
cond.notify(1)
|
|
cond.release()
|
|
test_utils.run_briefly(self.loop)
|
|
self.assertEqual([1], result)
|
|
|
|
self.loop.run_until_complete(cond.acquire())
|
|
cond.notify(1)
|
|
cond.notify(2048)
|
|
cond.release()
|
|
test_utils.run_briefly(self.loop)
|
|
self.assertEqual([1, 2, 3], result)
|
|
|
|
self.assertTrue(t1.done())
|
|
self.assertTrue(t1.result())
|
|
self.assertTrue(t2.done())
|
|
self.assertTrue(t2.result())
|
|
self.assertTrue(t3.done())
|
|
self.assertTrue(t3.result())
|
|
|
|
def test_notify_all(self):
|
|
cond = asyncio.Condition(loop=self.loop)
|
|
|
|
result = []
|
|
|
|
@asyncio.coroutine
|
|
def c1(result):
|
|
yield from cond.acquire()
|
|
if (yield from cond.wait()):
|
|
result.append(1)
|
|
cond.release()
|
|
return True
|
|
|
|
@asyncio.coroutine
|
|
def c2(result):
|
|
yield from cond.acquire()
|
|
if (yield from cond.wait()):
|
|
result.append(2)
|
|
cond.release()
|
|
return True
|
|
|
|
t1 = asyncio.Task(c1(result), loop=self.loop)
|
|
t2 = asyncio.Task(c2(result), loop=self.loop)
|
|
|
|
test_utils.run_briefly(self.loop)
|
|
self.assertEqual([], result)
|
|
|
|
self.loop.run_until_complete(cond.acquire())
|
|
cond.notify_all()
|
|
cond.release()
|
|
test_utils.run_briefly(self.loop)
|
|
self.assertEqual([1, 2], result)
|
|
|
|
self.assertTrue(t1.done())
|
|
self.assertTrue(t1.result())
|
|
self.assertTrue(t2.done())
|
|
self.assertTrue(t2.result())
|
|
|
|
def test_notify_unacquired(self):
|
|
cond = asyncio.Condition(loop=self.loop)
|
|
self.assertRaises(RuntimeError, cond.notify)
|
|
|
|
def test_notify_all_unacquired(self):
|
|
cond = asyncio.Condition(loop=self.loop)
|
|
self.assertRaises(RuntimeError, cond.notify_all)
|
|
|
|
def test_repr(self):
|
|
cond = asyncio.Condition(loop=self.loop)
|
|
self.assertTrue('unlocked' in repr(cond))
|
|
self.assertTrue(RGX_REPR.match(repr(cond)))
|
|
|
|
self.loop.run_until_complete(cond.acquire())
|
|
self.assertTrue('locked' in repr(cond))
|
|
|
|
cond._waiters.append(mock.Mock())
|
|
self.assertTrue('waiters:1' in repr(cond))
|
|
self.assertTrue(RGX_REPR.match(repr(cond)))
|
|
|
|
cond._waiters.append(mock.Mock())
|
|
self.assertTrue('waiters:2' in repr(cond))
|
|
self.assertTrue(RGX_REPR.match(repr(cond)))
|
|
|
|
def test_context_manager(self):
|
|
cond = asyncio.Condition(loop=self.loop)
|
|
|
|
@asyncio.coroutine
|
|
def acquire_cond():
|
|
return (yield from cond)
|
|
|
|
with self.loop.run_until_complete(acquire_cond()):
|
|
self.assertTrue(cond.locked())
|
|
|
|
self.assertFalse(cond.locked())
|
|
|
|
def test_context_manager_no_yield(self):
|
|
cond = asyncio.Condition(loop=self.loop)
|
|
|
|
try:
|
|
with cond:
|
|
self.fail('RuntimeError is not raised in with expression')
|
|
except RuntimeError as err:
|
|
self.assertEqual(
|
|
str(err),
|
|
'"yield from" should be used as context manager expression')
|
|
|
|
self.assertFalse(cond.locked())
|
|
|
|
|
|
class SemaphoreTests(test_utils.TestCase):
|
|
|
|
def setUp(self):
|
|
self.loop = self.new_test_loop()
|
|
|
|
def test_ctor_loop(self):
|
|
loop = mock.Mock()
|
|
sem = asyncio.Semaphore(loop=loop)
|
|
self.assertIs(sem._loop, loop)
|
|
|
|
sem = asyncio.Semaphore(loop=self.loop)
|
|
self.assertIs(sem._loop, self.loop)
|
|
|
|
def test_ctor_noloop(self):
|
|
asyncio.set_event_loop(self.loop)
|
|
sem = asyncio.Semaphore()
|
|
self.assertIs(sem._loop, self.loop)
|
|
|
|
def test_initial_value_zero(self):
|
|
sem = asyncio.Semaphore(0, loop=self.loop)
|
|
self.assertTrue(sem.locked())
|
|
|
|
def test_repr(self):
|
|
sem = asyncio.Semaphore(loop=self.loop)
|
|
self.assertTrue(repr(sem).endswith('[unlocked,value:1]>'))
|
|
self.assertTrue(RGX_REPR.match(repr(sem)))
|
|
|
|
self.loop.run_until_complete(sem.acquire())
|
|
self.assertTrue(repr(sem).endswith('[locked]>'))
|
|
self.assertTrue('waiters' not in repr(sem))
|
|
self.assertTrue(RGX_REPR.match(repr(sem)))
|
|
|
|
sem._waiters.append(mock.Mock())
|
|
self.assertTrue('waiters:1' in repr(sem))
|
|
self.assertTrue(RGX_REPR.match(repr(sem)))
|
|
|
|
sem._waiters.append(mock.Mock())
|
|
self.assertTrue('waiters:2' in repr(sem))
|
|
self.assertTrue(RGX_REPR.match(repr(sem)))
|
|
|
|
def test_semaphore(self):
|
|
sem = asyncio.Semaphore(loop=self.loop)
|
|
self.assertEqual(1, sem._value)
|
|
|
|
@asyncio.coroutine
|
|
def acquire_lock():
|
|
return (yield from sem)
|
|
|
|
res = self.loop.run_until_complete(acquire_lock())
|
|
|
|
self.assertTrue(res)
|
|
self.assertTrue(sem.locked())
|
|
self.assertEqual(0, sem._value)
|
|
|
|
sem.release()
|
|
self.assertFalse(sem.locked())
|
|
self.assertEqual(1, sem._value)
|
|
|
|
def test_semaphore_value(self):
|
|
self.assertRaises(ValueError, asyncio.Semaphore, -1)
|
|
|
|
def test_acquire(self):
|
|
sem = asyncio.Semaphore(3, loop=self.loop)
|
|
result = []
|
|
|
|
self.assertTrue(self.loop.run_until_complete(sem.acquire()))
|
|
self.assertTrue(self.loop.run_until_complete(sem.acquire()))
|
|
self.assertFalse(sem.locked())
|
|
|
|
@asyncio.coroutine
|
|
def c1(result):
|
|
yield from sem.acquire()
|
|
result.append(1)
|
|
return True
|
|
|
|
@asyncio.coroutine
|
|
def c2(result):
|
|
yield from sem.acquire()
|
|
result.append(2)
|
|
return True
|
|
|
|
@asyncio.coroutine
|
|
def c3(result):
|
|
yield from sem.acquire()
|
|
result.append(3)
|
|
return True
|
|
|
|
@asyncio.coroutine
|
|
def c4(result):
|
|
yield from sem.acquire()
|
|
result.append(4)
|
|
return True
|
|
|
|
t1 = asyncio.Task(c1(result), loop=self.loop)
|
|
t2 = asyncio.Task(c2(result), loop=self.loop)
|
|
t3 = asyncio.Task(c3(result), loop=self.loop)
|
|
|
|
test_utils.run_briefly(self.loop)
|
|
self.assertEqual([1], result)
|
|
self.assertTrue(sem.locked())
|
|
self.assertEqual(2, len(sem._waiters))
|
|
self.assertEqual(0, sem._value)
|
|
|
|
t4 = asyncio.Task(c4(result), loop=self.loop)
|
|
|
|
sem.release()
|
|
sem.release()
|
|
self.assertEqual(2, sem._value)
|
|
|
|
test_utils.run_briefly(self.loop)
|
|
self.assertEqual(0, sem._value)
|
|
self.assertEqual([1, 2, 3], result)
|
|
self.assertTrue(sem.locked())
|
|
self.assertEqual(1, len(sem._waiters))
|
|
self.assertEqual(0, sem._value)
|
|
|
|
self.assertTrue(t1.done())
|
|
self.assertTrue(t1.result())
|
|
self.assertTrue(t2.done())
|
|
self.assertTrue(t2.result())
|
|
self.assertTrue(t3.done())
|
|
self.assertTrue(t3.result())
|
|
self.assertFalse(t4.done())
|
|
|
|
# cleanup locked semaphore
|
|
sem.release()
|
|
self.loop.run_until_complete(t4)
|
|
|
|
def test_acquire_cancel(self):
|
|
sem = asyncio.Semaphore(loop=self.loop)
|
|
self.loop.run_until_complete(sem.acquire())
|
|
|
|
acquire = asyncio.Task(sem.acquire(), loop=self.loop)
|
|
self.loop.call_soon(acquire.cancel)
|
|
self.assertRaises(
|
|
asyncio.CancelledError,
|
|
self.loop.run_until_complete, acquire)
|
|
self.assertFalse(sem._waiters)
|
|
|
|
def test_release_not_acquired(self):
|
|
sem = asyncio.BoundedSemaphore(loop=self.loop)
|
|
|
|
self.assertRaises(ValueError, sem.release)
|
|
|
|
def test_release_no_waiters(self):
|
|
sem = asyncio.Semaphore(loop=self.loop)
|
|
self.loop.run_until_complete(sem.acquire())
|
|
self.assertTrue(sem.locked())
|
|
|
|
sem.release()
|
|
self.assertFalse(sem.locked())
|
|
|
|
def test_context_manager(self):
|
|
sem = asyncio.Semaphore(2, loop=self.loop)
|
|
|
|
@asyncio.coroutine
|
|
def acquire_lock():
|
|
return (yield from sem)
|
|
|
|
with self.loop.run_until_complete(acquire_lock()):
|
|
self.assertFalse(sem.locked())
|
|
self.assertEqual(1, sem._value)
|
|
|
|
with self.loop.run_until_complete(acquire_lock()):
|
|
self.assertTrue(sem.locked())
|
|
|
|
self.assertEqual(2, sem._value)
|
|
|
|
def test_context_manager_no_yield(self):
|
|
sem = asyncio.Semaphore(2, loop=self.loop)
|
|
|
|
try:
|
|
with sem:
|
|
self.fail('RuntimeError is not raised in with expression')
|
|
except RuntimeError as err:
|
|
self.assertEqual(
|
|
str(err),
|
|
'"yield from" should be used as context manager expression')
|
|
|
|
self.assertEqual(2, sem._value)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
unittest.main()
|