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"""Tests for futures.py."""
import concurrent.futures
import threading
import unittest
import unittest.mock
from asyncio import events
from asyncio import futures
from asyncio import test_utils
def _fakefunc(f):
return f
class FutureTests(unittest.TestCase):
def setUp(self):
self.loop = test_utils.TestLoop()
events.set_event_loop(None)
def tearDown(self):
self.loop.close()
def test_initial_state(self):
f = futures.Future(loop=self.loop)
self.assertFalse(f.cancelled())
self.assertFalse(f.done())
f.cancel()
self.assertTrue(f.cancelled())
def test_init_constructor_default_loop(self):
try:
events.set_event_loop(self.loop)
f = futures.Future()
self.assertIs(f._loop, self.loop)
finally:
events.set_event_loop(None)
def test_constructor_positional(self):
# Make sure Future does't accept a positional argument
self.assertRaises(TypeError, futures.Future, 42)
def test_cancel(self):
f = futures.Future(loop=self.loop)
self.assertTrue(f.cancel())
self.assertTrue(f.cancelled())
self.assertTrue(f.done())
self.assertRaises(futures.CancelledError, f.result)
self.assertRaises(futures.CancelledError, f.exception)
self.assertRaises(futures.InvalidStateError, f.set_result, None)
self.assertRaises(futures.InvalidStateError, f.set_exception, None)
self.assertFalse(f.cancel())
def test_result(self):
f = futures.Future(loop=self.loop)
self.assertRaises(futures.InvalidStateError, f.result)
f.set_result(42)
self.assertFalse(f.cancelled())
self.assertTrue(f.done())
self.assertEqual(f.result(), 42)
self.assertEqual(f.exception(), None)
self.assertRaises(futures.InvalidStateError, f.set_result, None)
self.assertRaises(futures.InvalidStateError, f.set_exception, None)
self.assertFalse(f.cancel())
def test_exception(self):
exc = RuntimeError()
f = futures.Future(loop=self.loop)
self.assertRaises(futures.InvalidStateError, f.exception)
f.set_exception(exc)
self.assertFalse(f.cancelled())
self.assertTrue(f.done())
self.assertRaises(RuntimeError, f.result)
self.assertEqual(f.exception(), exc)
self.assertRaises(futures.InvalidStateError, f.set_result, None)
self.assertRaises(futures.InvalidStateError, f.set_exception, None)
self.assertFalse(f.cancel())
def test_yield_from_twice(self):
f = futures.Future(loop=self.loop)
def fixture():
yield 'A'
x = yield from f
yield 'B', x
y = yield from f
yield 'C', y
g = fixture()
self.assertEqual(next(g), 'A') # yield 'A'.
self.assertEqual(next(g), f) # First yield from f.
f.set_result(42)
self.assertEqual(next(g), ('B', 42)) # yield 'B', x.
# The second "yield from f" does not yield f.
self.assertEqual(next(g), ('C', 42)) # yield 'C', y.
def test_repr(self):
f_pending = futures.Future(loop=self.loop)
self.assertEqual(repr(f_pending), 'Future<PENDING>')
f_pending.cancel()
f_cancelled = futures.Future(loop=self.loop)
f_cancelled.cancel()
self.assertEqual(repr(f_cancelled), 'Future<CANCELLED>')
f_result = futures.Future(loop=self.loop)
f_result.set_result(4)
self.assertEqual(repr(f_result), 'Future<result=4>')
self.assertEqual(f_result.result(), 4)
exc = RuntimeError()
f_exception = futures.Future(loop=self.loop)
f_exception.set_exception(exc)
self.assertEqual(repr(f_exception), 'Future<exception=RuntimeError()>')
self.assertIs(f_exception.exception(), exc)
f_few_callbacks = futures.Future(loop=self.loop)
f_few_callbacks.add_done_callback(_fakefunc)
self.assertIn('Future<PENDING, [<function _fakefunc',
repr(f_few_callbacks))
f_few_callbacks.cancel()
f_many_callbacks = futures.Future(loop=self.loop)
for i in range(20):
f_many_callbacks.add_done_callback(_fakefunc)
r = repr(f_many_callbacks)
self.assertIn('Future<PENDING, [<function _fakefunc', r)
self.assertIn('<18 more>', r)
f_many_callbacks.cancel()
def test_copy_state(self):
# Test the internal _copy_state method since it's being directly
# invoked in other modules.
f = futures.Future(loop=self.loop)
f.set_result(10)
newf = futures.Future(loop=self.loop)
newf._copy_state(f)
self.assertTrue(newf.done())
self.assertEqual(newf.result(), 10)
f_exception = futures.Future(loop=self.loop)
f_exception.set_exception(RuntimeError())
newf_exception = futures.Future(loop=self.loop)
newf_exception._copy_state(f_exception)
self.assertTrue(newf_exception.done())
self.assertRaises(RuntimeError, newf_exception.result)
f_cancelled = futures.Future(loop=self.loop)
f_cancelled.cancel()
newf_cancelled = futures.Future(loop=self.loop)
newf_cancelled._copy_state(f_cancelled)
self.assertTrue(newf_cancelled.cancelled())
def test_iter(self):
fut = futures.Future(loop=self.loop)
def coro():
yield from fut
def test():
arg1, arg2 = coro()
self.assertRaises(AssertionError, test)
fut.cancel()
@unittest.mock.patch('asyncio.futures.asyncio_log')
def test_tb_logger_abandoned(self, m_log):
fut = futures.Future(loop=self.loop)
del fut
self.assertFalse(m_log.error.called)
@unittest.mock.patch('asyncio.futures.asyncio_log')
def test_tb_logger_result_unretrieved(self, m_log):
fut = futures.Future(loop=self.loop)
fut.set_result(42)
del fut
self.assertFalse(m_log.error.called)
@unittest.mock.patch('asyncio.futures.asyncio_log')
def test_tb_logger_result_retrieved(self, m_log):
fut = futures.Future(loop=self.loop)
fut.set_result(42)
fut.result()
del fut
self.assertFalse(m_log.error.called)
@unittest.mock.patch('asyncio.futures.asyncio_log')
def test_tb_logger_exception_unretrieved(self, m_log):
fut = futures.Future(loop=self.loop)
fut.set_exception(RuntimeError('boom'))
del fut
test_utils.run_briefly(self.loop)
self.assertTrue(m_log.error.called)
@unittest.mock.patch('asyncio.futures.asyncio_log')
def test_tb_logger_exception_retrieved(self, m_log):
fut = futures.Future(loop=self.loop)
fut.set_exception(RuntimeError('boom'))
fut.exception()
del fut
self.assertFalse(m_log.error.called)
@unittest.mock.patch('asyncio.futures.asyncio_log')
def test_tb_logger_exception_result_retrieved(self, m_log):
fut = futures.Future(loop=self.loop)
fut.set_exception(RuntimeError('boom'))
self.assertRaises(RuntimeError, fut.result)
del fut
self.assertFalse(m_log.error.called)
def test_wrap_future(self):
def run(arg):
return (arg, threading.get_ident())
ex = concurrent.futures.ThreadPoolExecutor(1)
f1 = ex.submit(run, 'oi')
f2 = futures.wrap_future(f1, loop=self.loop)
res, ident = self.loop.run_until_complete(f2)
self.assertIsInstance(f2, futures.Future)
self.assertEqual(res, 'oi')
self.assertNotEqual(ident, threading.get_ident())
def test_wrap_future_future(self):
f1 = futures.Future(loop=self.loop)
f2 = futures.wrap_future(f1)
self.assertIs(f1, f2)
@unittest.mock.patch('asyncio.futures.events')
def test_wrap_future_use_global_loop(self, m_events):
def run(arg):
return (arg, threading.get_ident())
ex = concurrent.futures.ThreadPoolExecutor(1)
f1 = ex.submit(run, 'oi')
f2 = futures.wrap_future(f1)
self.assertIs(m_events.get_event_loop.return_value, f2._loop)
class FutureDoneCallbackTests(unittest.TestCase):
def setUp(self):
self.loop = test_utils.TestLoop()
events.set_event_loop(None)
def tearDown(self):
self.loop.close()
def run_briefly(self):
test_utils.run_briefly(self.loop)
def _make_callback(self, bag, thing):
# Create a callback function that appends thing to bag.
def bag_appender(future):
bag.append(thing)
return bag_appender
def _new_future(self):
return futures.Future(loop=self.loop)
def test_callbacks_invoked_on_set_result(self):
bag = []
f = self._new_future()
f.add_done_callback(self._make_callback(bag, 42))
f.add_done_callback(self._make_callback(bag, 17))
self.assertEqual(bag, [])
f.set_result('foo')
self.run_briefly()
self.assertEqual(bag, [42, 17])
self.assertEqual(f.result(), 'foo')
def test_callbacks_invoked_on_set_exception(self):
bag = []
f = self._new_future()
f.add_done_callback(self._make_callback(bag, 100))
self.assertEqual(bag, [])
exc = RuntimeError()
f.set_exception(exc)
self.run_briefly()
self.assertEqual(bag, [100])
self.assertEqual(f.exception(), exc)
def test_remove_done_callback(self):
bag = []
f = self._new_future()
cb1 = self._make_callback(bag, 1)
cb2 = self._make_callback(bag, 2)
cb3 = self._make_callback(bag, 3)
# Add one cb1 and one cb2.
f.add_done_callback(cb1)
f.add_done_callback(cb2)
# One instance of cb2 removed. Now there's only one cb1.
self.assertEqual(f.remove_done_callback(cb2), 1)
# Never had any cb3 in there.
self.assertEqual(f.remove_done_callback(cb3), 0)
# After this there will be 6 instances of cb1 and one of cb2.
f.add_done_callback(cb2)
for i in range(5):
f.add_done_callback(cb1)
# Remove all instances of cb1. One cb2 remains.
self.assertEqual(f.remove_done_callback(cb1), 6)
self.assertEqual(bag, [])
f.set_result('foo')
self.run_briefly()
self.assertEqual(bag, [2])
self.assertEqual(f.result(), 'foo')
if __name__ == '__main__':
unittest.main()
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