Method test_wait_first_exception

Lib/test/test_asyncio/test_tasks.py:1245–1272

(self)

        self.assertIsNone(b.result())

    def test_wait_first_exception(self):

        def gen():
            when = yield
            self.assertAlmostEqual(10.0, when)
            yield 0

        loop = self.new_test_loop(gen)

        # first_exception, task already has exception
        a = self.new_task(loop, asyncio.sleep(10.0))

        async def exc():
            raise ZeroDivisionError('err')

        b = self.new_task(loop, exc())
        task = self.new_task(
            loop,
            asyncio.wait([b, a], return_when=asyncio.FIRST_EXCEPTION))

        done, pending = loop.run_until_complete(task)
        self.assertEqual({b}, done)
        self.assertEqual({a}, pending)
        self.assertAlmostEqual(0, loop.time())

        # move forward to close generator
        loop.advance_time(10)
        loop.run_until_complete(asyncio.wait([a, b]))

    def test_wait_first_exception_in_wait(self):