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import pytest
from async_property import async_property
from async_property.base import AsyncPropertyDescriptor
from async_property.proxy import AwaitableOnly
pytestmark = pytest.mark.asyncio
class MyModel:
@async_property
async def foo(self) -> str:
return 'bar'
async def test_descriptor():
assert isinstance(MyModel.foo, AsyncPropertyDescriptor)
assert MyModel.foo.__name__ == 'foo'
assert MyModel.foo.__annotations__['return'] == str
async def test_property():
instance = MyModel()
assert isinstance(instance.foo, AwaitableOnly)
assert await instance.foo == 'bar'
async def test_multiple_calls():
instance = MyModel()
assert await instance.foo == 'bar'
assert await instance.foo == 'bar'
async def test_setter():
instance = MyModel()
with pytest.raises(ValueError):
instance.foo = 'abc'
async def test_deleter():
instance = MyModel()
with pytest.raises(ValueError):
del instance.foo
async def test_sync_error():
with pytest.raises(AssertionError):
class BadModel:
@async_property
def foo(self):
return 'bar'
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