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# Copyright 2019-2021 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Utilities for running the unit tests
"""
import json
import sys
import warnings
from asyncio import Future
from binascii import unhexlify
from typing import TYPE_CHECKING, Any, Awaitable, Callable, Optional, Tuple, TypeVar
from unittest.mock import Mock
import attr
import zope.interface
from twisted.internet.interfaces import IProtocol
from twisted.python.failure import Failure
from twisted.web.client import ResponseDone
from twisted.web.http import RESPONSES
from twisted.web.http_headers import Headers
from twisted.web.iweb import IResponse
from synapse.types import JsonDict
if TYPE_CHECKING:
from sys import UnraisableHookArgs
TV = TypeVar("TV")
def get_awaitable_result(awaitable: Awaitable[TV]) -> TV:
"""Get the result from an Awaitable which should have completed
Asserts that the given awaitable has a result ready, and returns its value
"""
i = awaitable.__await__()
try:
next(i)
except StopIteration as e:
# awaitable returned a result
return e.value
# if next didn't raise, the awaitable hasn't completed.
raise Exception("awaitable has not yet completed")
def make_awaitable(result: TV) -> Awaitable[TV]:
"""
Makes an awaitable, suitable for mocking an `async` function.
This uses Futures as they can be awaited multiple times so can be returned
to multiple callers.
"""
future: Future[TV] = Future()
future.set_result(result)
return future
def setup_awaitable_errors() -> Callable[[], None]:
"""
Convert warnings from a non-awaited coroutines into errors.
"""
warnings.simplefilter("error", RuntimeWarning)
# unraisablehook was added in Python 3.8.
if not hasattr(sys, "unraisablehook"):
return lambda: None
# State shared between unraisablehook and check_for_unraisable_exceptions.
unraisable_exceptions = []
orig_unraisablehook = sys.unraisablehook
def unraisablehook(unraisable: "UnraisableHookArgs") -> None:
unraisable_exceptions.append(unraisable.exc_value)
def cleanup() -> None:
"""
A method to be used as a clean-up that fails a test-case if there are any new unraisable exceptions.
"""
sys.unraisablehook = orig_unraisablehook
if unraisable_exceptions:
exc = unraisable_exceptions.pop()
assert exc is not None
raise exc
sys.unraisablehook = unraisablehook
return cleanup
def simple_async_mock(
return_value: Optional[TV] = None, raises: Optional[Exception] = None
) -> Mock:
# AsyncMock is not available in python3.5, this mimics part of its behaviour
async def cb(*args: Any, **kwargs: Any) -> Optional[TV]:
if raises:
raise raises
return return_value
return Mock(side_effect=cb)
# Type ignore: it does not fully implement IResponse, but is good enough for tests
@zope.interface.implementer(IResponse)
@attr.s(slots=True, frozen=True, auto_attribs=True)
class FakeResponse: # type: ignore[misc]
"""A fake twisted.web.IResponse object
there is a similar class at treq.test.test_response, but it lacks a `phrase`
attribute, and didn't support deliverBody until recently.
"""
version: Tuple[bytes, int, int] = (b"HTTP", 1, 1)
# HTTP response code
code: int = 200
# body of the response
body: bytes = b""
headers: Headers = attr.Factory(Headers)
@property
def phrase(self) -> bytes:
return RESPONSES.get(self.code, b"Unknown Status")
@property
def length(self) -> int:
return len(self.body)
def deliverBody(self, protocol: IProtocol) -> None:
protocol.dataReceived(self.body)
protocol.connectionLost(Failure(ResponseDone()))
@classmethod
def json(cls, *, code: int = 200, payload: JsonDict) -> "FakeResponse":
headers = Headers({"Content-Type": ["application/json"]})
body = json.dumps(payload).encode("utf-8")
return cls(code=code, body=body, headers=headers)
# A small image used in some tests.
#
# Resolution: 1×1, MIME type: image/png, Extension: png, Size: 67 B
SMALL_PNG = unhexlify(
b"89504e470d0a1a0a0000000d4948445200000001000000010806"
b"0000001f15c4890000000a49444154789c63000100000500010d"
b"0a2db40000000049454e44ae426082"
)
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