import asyncio import unittest import contextlib import socket from typing import Tuple, Optional, Any from unittest import mock from unittest.case import _Outcome try: from asyncio.runners import _cancel_all_tasks except ImportError: # this is only available in py3.7 def _cancel_all_tasks(loop): pass @contextlib.contextmanager def mock_tcp_and_udp(loop, udp_expected_addr=None, udp_replies=None, udp_delay_reply=0.0, sent_udp_packets=None, tcp_replies=None, tcp_delay_reply=0.0, sent_tcp_packets=None, add_potato_datagrams=False, raise_oserror_on_bind=False, raise_connectionerror=False): sent_udp_packets = sent_udp_packets if sent_udp_packets is not None else [] udp_replies = udp_replies or {} sent_tcp_packets = sent_tcp_packets if sent_tcp_packets is not None else [] tcp_replies = tcp_replies or {} async def create_connection(protocol_factory, host=None, port=None): if raise_connectionerror: raise ConnectionRefusedError() def get_write(p: asyncio.Protocol): def _write(data): sent_tcp_packets.append(data) if data in tcp_replies: reply = tcp_replies[data] i = 0 while i < len(reply): loop.call_later(tcp_delay_reply, p.data_received, reply[i:i+100]) i += 100 return else: pass return _write protocol = protocol_factory() write = get_write(protocol) class MockTransport(asyncio.Transport): def close(self): return def write(self, data): write(data) transport = MockTransport(extra={'socket': mock.Mock(spec=socket.socket)}) protocol.connection_made(transport) return transport, protocol async def create_datagram_endpoint(proto_lam, sock=None): def get_sendto(p: asyncio.DatagramProtocol): def _sendto(data, addr): sent_udp_packets.append(data) loop.call_later(udp_delay_reply, p.datagram_received, data, (p.bind_address, 1900)) if add_potato_datagrams: loop.call_soon(p.datagram_received, b'potato', ('?.?.?.?', 1900)) if (data, addr) in udp_replies: loop.call_later(udp_delay_reply, p.datagram_received, udp_replies[(data, addr)], (udp_expected_addr, 1900)) return _sendto protocol = proto_lam() sendto = get_sendto(protocol) class MockDatagramTransport(asyncio.DatagramTransport): def __init__(self, sock): super().__init__(extra={'socket': sock}) self._sock = sock def close(self): self._sock.close() return def sendto(self, data: Any, addr: Optional[Tuple[str, int]] = ...) -> None: sendto(data, addr) transport = MockDatagramTransport(mock_sock) protocol.connection_made(transport) return transport, protocol with mock.patch('socket.socket') as mock_socket: mock_sock = mock.Mock(spec=socket.socket) mock_sock.setsockopt = lambda *_: None def bind(*_): if raise_oserror_on_bind: raise OSError() return mock_sock.bind = bind mock_sock.setblocking = lambda *_: None mock_sock.getsockname = lambda: "0.0.0.0" mock_sock.getpeername = lambda: "" mock_sock.close = lambda: None mock_sock.type = socket.SOCK_DGRAM mock_sock.fileno = lambda: 7 mock_socket.return_value = mock_sock loop.create_datagram_endpoint = create_datagram_endpoint loop.create_connection = create_connection yield class AsyncioTestCase(unittest.TestCase): # Implementation inspired by discussion: # https://bugs.python.org/issue32972 maxDiff = None async def asyncSetUp(self): # pylint: disable=C0103 pass async def asyncTearDown(self): # pylint: disable=C0103 pass def run(self, result=None): # pylint: disable=R0915 orig_result = result if result is None: result = self.defaultTestResult() startTestRun = getattr(result, 'startTestRun', None) # pylint: disable=C0103 if startTestRun is not None: startTestRun() result.startTest(self) testMethod = getattr(self, self._testMethodName) # pylint: disable=C0103 if (getattr(self.__class__, "__unittest_skip__", False) or getattr(testMethod, "__unittest_skip__", False)): # If the class or method was skipped. try: skip_why = (getattr(self.__class__, '__unittest_skip_why__', '') or getattr(testMethod, '__unittest_skip_why__', '')) self._addSkip(result, self, skip_why) finally: result.stopTest(self) return expecting_failure_method = getattr(testMethod, "__unittest_expecting_failure__", False) expecting_failure_class = getattr(self, "__unittest_expecting_failure__", False) expecting_failure = expecting_failure_class or expecting_failure_method outcome = _Outcome(result) self.loop = asyncio.new_event_loop() # pylint: disable=W0201 asyncio.set_event_loop(self.loop) self.loop.set_debug(True) try: self._outcome = outcome with outcome.testPartExecutor(self): self.setUp() self.loop.run_until_complete(self.asyncSetUp()) if outcome.success: outcome.expecting_failure = expecting_failure with outcome.testPartExecutor(self, isTest=True): maybe_coroutine = testMethod() if asyncio.iscoroutine(maybe_coroutine): self.loop.run_until_complete(maybe_coroutine) outcome.expecting_failure = False with outcome.testPartExecutor(self): self.loop.run_until_complete(self.asyncTearDown()) self.tearDown() self.doAsyncCleanups() try: _cancel_all_tasks(self.loop) self.loop.run_until_complete(self.loop.shutdown_asyncgens()) finally: asyncio.set_event_loop(None) self.loop.close() for test, reason in outcome.skipped: self._addSkip(result, test, reason) self._feedErrorsToResult(result, outcome.errors) if outcome.success: if expecting_failure: if outcome.expectedFailure: self._addExpectedFailure(result, outcome.expectedFailure) else: self._addUnexpectedSuccess(result) else: result.addSuccess(self) return result finally: result.stopTest(self) if orig_result is None: stopTestRun = getattr(result, 'stopTestRun', None) # pylint: disable=C0103 if stopTestRun is not None: stopTestRun() # pylint: disable=E1102 # explicitly break reference cycles: # outcome.errors -> frame -> outcome -> outcome.errors # outcome.expectedFailure -> frame -> outcome -> outcome.expectedFailure outcome.errors.clear() outcome.expectedFailure = None # clear the outcome, no more needed self._outcome = None def doAsyncCleanups(self): # pylint: disable=C0103 outcome = self._outcome or _Outcome() while self._cleanups: function, args, kwargs = self._cleanups.pop() with outcome.testPartExecutor(self): maybe_coroutine = function(*args, **kwargs) if asyncio.iscoroutine(maybe_coroutine): self.loop.run_until_complete(maybe_coroutine)