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import unittest
import wrapt
class TestAutoObjectProxy(unittest.TestCase):
def test_call(self):
class Callable:
def __call__(self, x):
return x + 1
base = wrapt.BaseObjectProxy(object())
self.assertFalse(hasattr(base, "__call__"))
self.assertFalse(callable(base))
proxy = wrapt.AutoObjectProxy(Callable())
self.assertTrue(hasattr(proxy, "__call__"))
self.assertTrue(callable(proxy))
self.assertEqual(proxy(2), 3)
def test_iter(self):
class Iterable:
def __iter__(self):
return iter([1, 2, 3])
base = wrapt.BaseObjectProxy(object())
self.assertFalse(hasattr(base, "__iter__"))
self.assertFalse(hasattr(base, "__next__"))
proxy = wrapt.AutoObjectProxy(Iterable())
self.assertTrue(hasattr(proxy, "__iter__"))
self.assertFalse(hasattr(proxy, "__next__"))
self.assertEqual(list(proxy), [1, 2, 3])
def test_next(self):
class Iterator:
def __init__(self):
self._iter = iter([1, 2, 3])
def __iter__(self):
return self
def __next__(self):
return next(self._iter)
base = wrapt.BaseObjectProxy(object())
self.assertFalse(hasattr(base, "__iter__"))
self.assertFalse(hasattr(base, "__next__"))
proxy = wrapt.AutoObjectProxy(Iterator())
self.assertTrue(hasattr(proxy, "__iter__"))
self.assertTrue(hasattr(proxy, "__next__"))
self.assertEqual(list(proxy), [1, 2, 3])
def test_aiter(self):
class AsyncIterable:
def __aiter__(self):
self._iter = iter([1, 2, 3])
return self
async def __anext__(self):
try:
return next(self._iter)
except StopIteration:
raise StopAsyncIteration
base = wrapt.BaseObjectProxy(object())
self.assertFalse(hasattr(base, "__aiter__"))
self.assertFalse(hasattr(base, "__anext__"))
proxy = wrapt.AutoObjectProxy(AsyncIterable())
self.assertTrue(hasattr(proxy, "__aiter__"))
self.assertTrue(hasattr(proxy, "__anext__"))
async def iterate():
result = []
async for item in proxy:
result.append(item)
return result
import asyncio
self.assertEqual(asyncio.run(iterate()), [1, 2, 3])
def test_length_hint(self):
import operator
self.assertTrue(hasattr(operator, "length_hint"))
class LengthHint:
def __length_hint__(self):
return 42
base = wrapt.BaseObjectProxy(object())
self.assertFalse(hasattr(base, "__length_hint__"))
proxy = wrapt.AutoObjectProxy(LengthHint())
self.assertTrue(hasattr(proxy, "__length_hint__"))
self.assertEqual(operator.length_hint(proxy), 42)
def test_await(self):
class Awaitable:
def __await__(self):
yield
return 42
base = wrapt.BaseObjectProxy(object())
self.assertFalse(hasattr(base, "__await__"))
proxy = wrapt.AutoObjectProxy(Awaitable())
self.assertTrue(hasattr(proxy, "__await__"))
async def await_proxy():
return await proxy
import asyncio
self.assertEqual(asyncio.run(await_proxy()), 42)
def test_descriptor(self):
class Descriptor:
def __init__(self, value):
self.value = value
def __get__(self, instance, owner):
assert self.name == "attr"
assert self.owner == owner
if instance is None:
return self
return self.value
def __set__(self, instance, value):
self.value = value
def __delete__(self, instance):
del self.value
def __set_name__(self, owner, name):
self.owner = owner
self.name = name
base = wrapt.BaseObjectProxy(object())
self.assertFalse(hasattr(base, "__get__"))
self.assertFalse(hasattr(base, "__set__"))
self.assertFalse(hasattr(base, "__delete__"))
self.assertFalse(hasattr(base, "__set_name__"))
proxy = wrapt.AutoObjectProxy(Descriptor(42))
self.assertTrue(hasattr(proxy, "__get__"))
self.assertTrue(hasattr(proxy, "__set__"))
self.assertTrue(hasattr(proxy, "__delete__"))
self.assertTrue(hasattr(proxy, "__set_name__"))
class Owner:
attr = wrapt.AutoObjectProxy(Descriptor(42))
owner = Owner()
self.assertEqual(owner.attr, 42)
owner.attr = 100
self.assertEqual(owner.attr, 100)
del owner.attr
self.assertRaises(AttributeError, lambda: owner.attr)
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