tests: Add 6 tests for async await/for/with.
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# test basic await expression
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# adapted from PEP0492
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async def abinary(n):
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print(n)
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if n <= 0:
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return 1
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l = await abinary(n - 1)
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r = await abinary(n - 1)
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return l + 1 + r
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o = abinary(4)
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try:
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while True:
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o.send(None)
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except StopIteration:
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print('finished')
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# test await expression
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import sys
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if sys.implementation.name == 'micropython':
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# uPy allows normal generators to be awaitables
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coroutine = lambda f: f
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else:
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import types
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coroutine = types.coroutine
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@coroutine
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def wait(value):
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print('wait value:', value)
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msg = yield 'message from wait(%u)' % value
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print('wait got back:', msg)
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return 10
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async def f():
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x = await wait(1)**2
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print('x =', x)
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coro = f()
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print('return from send:', coro.send(None))
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try:
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coro.send('message from main')
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except StopIteration:
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print('got StopIteration')
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# test basic async for execution
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# example taken from PEP0492
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class AsyncIteratorWrapper:
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def __init__(self, obj):
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print('init')
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self._it = iter(obj)
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async def __aiter__(self):
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print('aiter')
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return self
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async def __anext__(self):
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print('anext')
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try:
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value = next(self._it)
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except StopIteration:
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raise StopAsyncIteration
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return value
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async def coro():
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async for letter in AsyncIteratorWrapper('abc'):
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print(letter)
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o = coro()
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try:
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o.send(None)
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except StopIteration:
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print('finished')
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# test waiting within "async for" aiter/anext functions
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import sys
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if sys.implementation.name == 'micropython':
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# uPy allows normal generators to be awaitables
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coroutine = lambda f: f
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else:
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import types
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coroutine = types.coroutine
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@coroutine
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def f(x):
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print('f start:', x)
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yield x + 1
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yield x + 2
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return x + 3
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class ARange:
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def __init__(self, high):
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print('init')
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self.cur = 0
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self.high = high
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async def __aiter__(self):
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print('aiter')
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print('f returned:', await f(10))
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return self
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async def __anext__(self):
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print('anext')
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print('f returned:', await f(20))
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if self.cur < self.high:
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val = self.cur
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self.cur += 1
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return val
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else:
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raise StopAsyncIteration
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async def coro():
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async for x in ARange(4):
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print('x', x)
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o = coro()
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try:
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while True:
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print('coro yielded:', o.send(None))
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except StopIteration:
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print('finished')
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# test simple async with execution
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class AContext:
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async def __aenter__(self):
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print('enter')
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async def __aexit__(self, exc_type, exc, tb):
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print('exit')
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async def f():
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async with AContext():
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print('body')
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o = f()
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try:
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o.send(None)
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except StopIteration:
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print('finished')
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# test waiting within async with enter/exit functions
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import sys
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if sys.implementation.name == 'micropython':
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# uPy allows normal generators to be awaitables
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coroutine = lambda f: f
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else:
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import types
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coroutine = types.coroutine
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@coroutine
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def f(x):
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print('f start:', x)
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yield x + 1
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yield x + 2
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return x + 3
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class AContext:
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async def __aenter__(self):
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print('enter')
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print('f returned:', await f(10))
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async def __aexit__(self, exc_type, exc, tb):
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print('exit')
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print('f returned:', await f(20))
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async def coro():
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async with AContext():
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print('body start')
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print('body f returned:', await f(30))
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print('body end')
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o = coro()
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try:
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while True:
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print('coro yielded:', o.send(None))
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except StopIteration:
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print('finished')
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