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