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class AppTestCoroutine:
def test_cannot_iterate(self): """
async def f(x):
pass
raises(TypeError, "for i in f(5): pass")
raises(TypeError, iter, f(5))
raises(TypeError, next, f(5))
"""
def test_async_for(self): """
class X:
def __aiter__(self):
return MyAIter()
class MyAIter:
async def __anext__(self):
return 42
async def f(x):
sum = 0
async for a in x:
sum += a
if sum > 100:
break
return sum
cr = f(X())
try:
cr.send(None)
except StopIteration as e:
assert e.value == 42 * 3
else:
assert False, "should have raised"
"""
def test_StopAsyncIteration(self): """
class X:
def __aiter__(self):
return MyAIter()
class MyAIter:
count = 0
async def __anext__(self):
if self.count == 3:
raise StopAsyncIteration
self.count += 1
return 42
async def f(x):
sum = 0
async for a in x:
sum += a
return sum
cr = f(X())
try:
cr.send(None)
except StopIteration as e:
assert e.value == 42 * 3
else:
assert False, "should have raised"
"""
def test_async_for_old_style(self): """
class X:
def __aiter__(self):
return MyAIter()
class MyAIter:
def __await__(self):
return iter([20, 30])
async def f(x):
sum = 0
async for a in x:
sum += a
if sum > 100:
break
return sum
cr = f(X())
assert next(cr.__await__()) == 20
"""
def test_set_coroutine_wrapper(self): """
import sys
async def f():
pass
seen = []
def my_wrapper(cr):
seen.append(cr)
return 42
assert sys.get_coroutine_wrapper() is None
sys.set_coroutine_wrapper(my_wrapper)
assert sys.get_coroutine_wrapper() is my_wrapper
cr = f()
assert cr == 42
sys.set_coroutine_wrapper(None)
assert sys.get_coroutine_wrapper() is None
"""
def test_async_with(self): """
seen = []
class X:
async def __aenter__(self):
seen.append('aenter')
async def __aexit__(self, *args):
seen.append('aexit')
async def f(x):
async with x:
return 42
c = f(X())
try:
c.send(None)
except StopIteration as e:
assert e.value == 42
else:
assert False, "should have raised"
assert seen == ['aenter', 'aexit']
"""
def test_async_with_exit_True(self): """
seen = []
class X:
async def __aenter__(self):
seen.append('aenter')
async def __aexit__(self, *args):
seen.append('aexit')
return True
async def f(x):
async with x:
return 42
c = f(X())
try:
c.send(None)
except StopIteration as e:
assert e.value == 42
else:
assert False, "should have raised"
assert seen == ['aenter', 'aexit']
"""
def test_await(self): """
class X:
def __await__(self):
i1 = yield 40
assert i1 == 82
i2 = yield 41
assert i2 == 93
async def f():
await X()
await X()
c = f()
assert c.send(None) == 40
assert c.send(82) == 41
assert c.send(93) == 40
assert c.send(82) == 41
raises(StopIteration, c.send, 93)
"""
def test_await_error(self): """
async def f():
await [42]
c = f()
try:
c.send(None)
except TypeError as e:
assert str(e) == "object list can't be used in 'await' expression"
else:
assert False, "should have raised"
"""
def test_async_with_exception_context(self): """
class CM:
async def __aenter__(self):
pass
async def __aexit__(self, *e):
1/0
async def f():
async with CM():
raise ValueError
c = f()
try:
c.send(None)
except ZeroDivisionError as e:
assert e.__context__ is not None
assert isinstance(e.__context__, ValueError)
else:
assert False, "should have raised"
"""
def test_runtime_warning(self): """
import gc, warnings
async def foobaz():
pass
with warnings.catch_warnings(record=True) as l:
foobaz()
gc.collect()
gc.collect()
gc.collect()
assert len(l) == 1, repr(l)
w = l[0].message
assert isinstance(w, RuntimeWarning)
assert str(w).startswith("coroutine ")
assert str(w).endswith("foobaz' was never awaited")
"""
def test_async_for_with_tuple_subclass(self): """
class Done(Exception): pass
class AIter(tuple):
i = 0
def __aiter__(self):
return self
async def __anext__(self):
if self.i >= len(self):
raise StopAsyncIteration
self.i += 1
return self[self.i - 1]
result = []
async def foo():
async for i in AIter([42]):
result.append(i)
raise Done
try:
foo().send(None)
except Done:
pass
assert result == [42]
"""
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