791 lines
29 KiB
Python
791 lines
29 KiB
Python
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"""Support classes for automated testing.
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* `AsyncTestCase` and `AsyncHTTPTestCase`: Subclasses of unittest.TestCase
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with additional support for testing asynchronous (`.IOLoop`-based) code.
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* `ExpectLog`: Make test logs less spammy.
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* `main()`: A simple test runner (wrapper around unittest.main()) with support
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for the tornado.autoreload module to rerun the tests when code changes.
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"""
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import asyncio
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from collections.abc import Generator
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import functools
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import inspect
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import logging
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import os
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import re
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import signal
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import socket
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import sys
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import unittest
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from tornado import gen
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from tornado.httpclient import AsyncHTTPClient, HTTPResponse
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from tornado.httpserver import HTTPServer
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from tornado.ioloop import IOLoop, TimeoutError
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from tornado import netutil
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from tornado.platform.asyncio import AsyncIOMainLoop
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from tornado.process import Subprocess
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from tornado.log import app_log
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from tornado.util import raise_exc_info, basestring_type
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from tornado.web import Application
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import typing
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from typing import Tuple, Any, Callable, Type, Dict, Union, Optional
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from types import TracebackType
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if typing.TYPE_CHECKING:
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# Coroutine wasn't added to typing until 3.5.3, so only import it
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# when mypy is running and use forward references.
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from typing import Coroutine # noqa: F401
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_ExcInfoTuple = Tuple[
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Optional[Type[BaseException]], Optional[BaseException], Optional[TracebackType]
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]
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_NON_OWNED_IOLOOPS = AsyncIOMainLoop
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def bind_unused_port(reuse_port: bool = False) -> Tuple[socket.socket, int]:
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"""Binds a server socket to an available port on localhost.
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Returns a tuple (socket, port).
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.. versionchanged:: 4.4
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Always binds to ``127.0.0.1`` without resolving the name
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``localhost``.
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"""
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sock = netutil.bind_sockets(
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0, "127.0.0.1", family=socket.AF_INET, reuse_port=reuse_port
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)[0]
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port = sock.getsockname()[1]
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return sock, port
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def get_async_test_timeout() -> float:
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"""Get the global timeout setting for async tests.
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Returns a float, the timeout in seconds.
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.. versionadded:: 3.1
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"""
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env = os.environ.get("ASYNC_TEST_TIMEOUT")
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if env is not None:
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try:
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return float(env)
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except ValueError:
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pass
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return 5
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class _TestMethodWrapper(object):
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"""Wraps a test method to raise an error if it returns a value.
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This is mainly used to detect undecorated generators (if a test
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method yields it must use a decorator to consume the generator),
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but will also detect other kinds of return values (these are not
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necessarily errors, but we alert anyway since there is no good
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reason to return a value from a test).
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"""
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def __init__(self, orig_method: Callable) -> None:
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self.orig_method = orig_method
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def __call__(self, *args: Any, **kwargs: Any) -> None:
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result = self.orig_method(*args, **kwargs)
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if isinstance(result, Generator) or inspect.iscoroutine(result):
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raise TypeError(
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"Generator and coroutine test methods should be"
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" decorated with tornado.testing.gen_test"
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)
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elif result is not None:
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raise ValueError("Return value from test method ignored: %r" % result)
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def __getattr__(self, name: str) -> Any:
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"""Proxy all unknown attributes to the original method.
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This is important for some of the decorators in the `unittest`
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module, such as `unittest.skipIf`.
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"""
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return getattr(self.orig_method, name)
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class AsyncTestCase(unittest.TestCase):
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"""`~unittest.TestCase` subclass for testing `.IOLoop`-based
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asynchronous code.
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The unittest framework is synchronous, so the test must be
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complete by the time the test method returns. This means that
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asynchronous code cannot be used in quite the same way as usual
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and must be adapted to fit. To write your tests with coroutines,
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decorate your test methods with `tornado.testing.gen_test` instead
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of `tornado.gen.coroutine`.
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This class also provides the (deprecated) `stop()` and `wait()`
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methods for a more manual style of testing. The test method itself
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must call ``self.wait()``, and asynchronous callbacks should call
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``self.stop()`` to signal completion.
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By default, a new `.IOLoop` is constructed for each test and is available
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as ``self.io_loop``. If the code being tested requires a
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global `.IOLoop`, subclasses should override `get_new_ioloop` to return it.
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The `.IOLoop`'s ``start`` and ``stop`` methods should not be
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called directly. Instead, use `self.stop <stop>` and `self.wait
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<wait>`. Arguments passed to ``self.stop`` are returned from
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``self.wait``. It is possible to have multiple ``wait``/``stop``
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cycles in the same test.
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Example::
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# This test uses coroutine style.
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class MyTestCase(AsyncTestCase):
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@tornado.testing.gen_test
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def test_http_fetch(self):
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client = AsyncHTTPClient()
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response = yield client.fetch("http://www.tornadoweb.org")
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# Test contents of response
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self.assertIn("FriendFeed", response.body)
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# This test uses argument passing between self.stop and self.wait.
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class MyTestCase2(AsyncTestCase):
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def test_http_fetch(self):
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client = AsyncHTTPClient()
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client.fetch("http://www.tornadoweb.org/", self.stop)
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response = self.wait()
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# Test contents of response
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self.assertIn("FriendFeed", response.body)
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"""
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def __init__(self, methodName: str = "runTest") -> None:
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super(AsyncTestCase, self).__init__(methodName)
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self.__stopped = False
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self.__running = False
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self.__failure = None # type: Optional[_ExcInfoTuple]
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self.__stop_args = None # type: Any
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self.__timeout = None # type: Optional[object]
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# It's easy to forget the @gen_test decorator, but if you do
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# the test will silently be ignored because nothing will consume
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# the generator. Replace the test method with a wrapper that will
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# make sure it's not an undecorated generator.
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setattr(self, methodName, _TestMethodWrapper(getattr(self, methodName)))
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# Not used in this class itself, but used by @gen_test
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self._test_generator = None # type: Optional[Union[Generator, Coroutine]]
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def setUp(self) -> None:
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super(AsyncTestCase, self).setUp()
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self.io_loop = self.get_new_ioloop()
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self.io_loop.make_current()
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def tearDown(self) -> None:
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# Native coroutines tend to produce warnings if they're not
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# allowed to run to completion. It's difficult to ensure that
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# this always happens in tests, so cancel any tasks that are
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# still pending by the time we get here.
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asyncio_loop = self.io_loop.asyncio_loop # type: ignore
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if hasattr(asyncio, "all_tasks"): # py37
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tasks = asyncio.all_tasks(asyncio_loop) # type: ignore
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else:
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tasks = asyncio.Task.all_tasks(asyncio_loop)
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# Tasks that are done may still appear here and may contain
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# non-cancellation exceptions, so filter them out.
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tasks = [t for t in tasks if not t.done()]
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for t in tasks:
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t.cancel()
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# Allow the tasks to run and finalize themselves (which means
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# raising a CancelledError inside the coroutine). This may
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# just transform the "task was destroyed but it is pending"
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# warning into a "uncaught CancelledError" warning, but
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# catching CancelledErrors in coroutines that may leak is
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# simpler than ensuring that no coroutines leak.
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if tasks:
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done, pending = self.io_loop.run_sync(lambda: asyncio.wait(tasks))
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assert not pending
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# If any task failed with anything but a CancelledError, raise it.
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for f in done:
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try:
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f.result()
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except asyncio.CancelledError:
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pass
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# Clean up Subprocess, so it can be used again with a new ioloop.
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Subprocess.uninitialize()
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self.io_loop.clear_current()
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if not isinstance(self.io_loop, _NON_OWNED_IOLOOPS):
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# Try to clean up any file descriptors left open in the ioloop.
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# This avoids leaks, especially when tests are run repeatedly
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# in the same process with autoreload (because curl does not
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# set FD_CLOEXEC on its file descriptors)
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self.io_loop.close(all_fds=True)
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super(AsyncTestCase, self).tearDown()
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# In case an exception escaped or the StackContext caught an exception
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# when there wasn't a wait() to re-raise it, do so here.
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# This is our last chance to raise an exception in a way that the
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# unittest machinery understands.
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self.__rethrow()
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def get_new_ioloop(self) -> IOLoop:
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"""Returns the `.IOLoop` to use for this test.
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By default, a new `.IOLoop` is created for each test.
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Subclasses may override this method to return
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`.IOLoop.current()` if it is not appropriate to use a new
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`.IOLoop` in each tests (for example, if there are global
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singletons using the default `.IOLoop`) or if a per-test event
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loop is being provided by another system (such as
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``pytest-asyncio``).
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"""
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return IOLoop()
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def _handle_exception(
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self, typ: Type[Exception], value: Exception, tb: TracebackType
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) -> bool:
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if self.__failure is None:
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self.__failure = (typ, value, tb)
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else:
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app_log.error(
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"multiple unhandled exceptions in test", exc_info=(typ, value, tb)
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)
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self.stop()
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return True
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def __rethrow(self) -> None:
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if self.__failure is not None:
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failure = self.__failure
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self.__failure = None
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raise_exc_info(failure)
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def run(self, result: unittest.TestResult = None) -> unittest.TestCase:
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ret = super(AsyncTestCase, self).run(result)
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# As a last resort, if an exception escaped super.run() and wasn't
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# re-raised in tearDown, raise it here. This will cause the
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# unittest run to fail messily, but that's better than silently
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# ignoring an error.
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self.__rethrow()
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return ret
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def stop(self, _arg: Any = None, **kwargs: Any) -> None:
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"""Stops the `.IOLoop`, causing one pending (or future) call to `wait()`
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to return.
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Keyword arguments or a single positional argument passed to `stop()` are
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saved and will be returned by `wait()`.
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.. deprecated:: 5.1
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`stop` and `wait` are deprecated; use ``@gen_test`` instead.
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"""
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assert _arg is None or not kwargs
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self.__stop_args = kwargs or _arg
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if self.__running:
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self.io_loop.stop()
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self.__running = False
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self.__stopped = True
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def wait(
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self, condition: Callable[..., bool] = None, timeout: float = None
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) -> None:
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"""Runs the `.IOLoop` until stop is called or timeout has passed.
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In the event of a timeout, an exception will be thrown. The
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default timeout is 5 seconds; it may be overridden with a
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``timeout`` keyword argument or globally with the
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``ASYNC_TEST_TIMEOUT`` environment variable.
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If ``condition`` is not ``None``, the `.IOLoop` will be restarted
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after `stop()` until ``condition()`` returns ``True``.
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.. versionchanged:: 3.1
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Added the ``ASYNC_TEST_TIMEOUT`` environment variable.
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.. deprecated:: 5.1
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`stop` and `wait` are deprecated; use ``@gen_test`` instead.
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"""
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if timeout is None:
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timeout = get_async_test_timeout()
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if not self.__stopped:
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if timeout:
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def timeout_func() -> None:
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try:
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raise self.failureException(
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"Async operation timed out after %s seconds" % timeout
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)
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except Exception:
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self.__failure = sys.exc_info()
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self.stop()
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self.__timeout = self.io_loop.add_timeout(
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self.io_loop.time() + timeout, timeout_func
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)
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while True:
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self.__running = True
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self.io_loop.start()
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if self.__failure is not None or condition is None or condition():
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break
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if self.__timeout is not None:
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self.io_loop.remove_timeout(self.__timeout)
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self.__timeout = None
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assert self.__stopped
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self.__stopped = False
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self.__rethrow()
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result = self.__stop_args
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self.__stop_args = None
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return result
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class AsyncHTTPTestCase(AsyncTestCase):
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"""A test case that starts up an HTTP server.
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Subclasses must override `get_app()`, which returns the
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`tornado.web.Application` (or other `.HTTPServer` callback) to be tested.
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Tests will typically use the provided ``self.http_client`` to fetch
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URLs from this server.
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Example, assuming the "Hello, world" example from the user guide is in
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``hello.py``::
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import hello
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class TestHelloApp(AsyncHTTPTestCase):
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def get_app(self):
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return hello.make_app()
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def test_homepage(self):
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response = self.fetch('/')
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self.assertEqual(response.code, 200)
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self.assertEqual(response.body, 'Hello, world')
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That call to ``self.fetch()`` is equivalent to ::
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self.http_client.fetch(self.get_url('/'), self.stop)
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response = self.wait()
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which illustrates how AsyncTestCase can turn an asynchronous operation,
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|
|
like ``http_client.fetch()``, into a synchronous operation. If you need
|
||
|
|
to do other asynchronous operations in tests, you'll probably need to use
|
||
|
|
``stop()`` and ``wait()`` yourself.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def setUp(self) -> None:
|
||
|
|
super(AsyncHTTPTestCase, self).setUp()
|
||
|
|
sock, port = bind_unused_port()
|
||
|
|
self.__port = port
|
||
|
|
|
||
|
|
self.http_client = self.get_http_client()
|
||
|
|
self._app = self.get_app()
|
||
|
|
self.http_server = self.get_http_server()
|
||
|
|
self.http_server.add_sockets([sock])
|
||
|
|
|
||
|
|
def get_http_client(self) -> AsyncHTTPClient:
|
||
|
|
return AsyncHTTPClient()
|
||
|
|
|
||
|
|
def get_http_server(self) -> HTTPServer:
|
||
|
|
return HTTPServer(self._app, **self.get_httpserver_options())
|
||
|
|
|
||
|
|
def get_app(self) -> Application:
|
||
|
|
"""Should be overridden by subclasses to return a
|
||
|
|
`tornado.web.Application` or other `.HTTPServer` callback.
|
||
|
|
"""
|
||
|
|
raise NotImplementedError()
|
||
|
|
|
||
|
|
def fetch(
|
||
|
|
self, path: str, raise_error: bool = False, **kwargs: Any
|
||
|
|
) -> HTTPResponse:
|
||
|
|
"""Convenience method to synchronously fetch a URL.
|
||
|
|
|
||
|
|
The given path will be appended to the local server's host and
|
||
|
|
port. Any additional keyword arguments will be passed directly to
|
||
|
|
`.AsyncHTTPClient.fetch` (and so could be used to pass
|
||
|
|
``method="POST"``, ``body="..."``, etc).
|
||
|
|
|
||
|
|
If the path begins with http:// or https://, it will be treated as a
|
||
|
|
full URL and will be fetched as-is.
|
||
|
|
|
||
|
|
If ``raise_error`` is ``True``, a `tornado.httpclient.HTTPError` will
|
||
|
|
be raised if the response code is not 200. This is the same behavior
|
||
|
|
as the ``raise_error`` argument to `.AsyncHTTPClient.fetch`, but
|
||
|
|
the default is ``False`` here (it's ``True`` in `.AsyncHTTPClient`)
|
||
|
|
because tests often need to deal with non-200 response codes.
|
||
|
|
|
||
|
|
.. versionchanged:: 5.0
|
||
|
|
Added support for absolute URLs.
|
||
|
|
|
||
|
|
.. versionchanged:: 5.1
|
||
|
|
|
||
|
|
Added the ``raise_error`` argument.
|
||
|
|
|
||
|
|
.. deprecated:: 5.1
|
||
|
|
|
||
|
|
This method currently turns any exception into an
|
||
|
|
`.HTTPResponse` with status code 599. In Tornado 6.0,
|
||
|
|
errors other than `tornado.httpclient.HTTPError` will be
|
||
|
|
passed through, and ``raise_error=False`` will only
|
||
|
|
suppress errors that would be raised due to non-200
|
||
|
|
response codes.
|
||
|
|
|
||
|
|
"""
|
||
|
|
if path.lower().startswith(("http://", "https://")):
|
||
|
|
url = path
|
||
|
|
else:
|
||
|
|
url = self.get_url(path)
|
||
|
|
return self.io_loop.run_sync(
|
||
|
|
lambda: self.http_client.fetch(url, raise_error=raise_error, **kwargs),
|
||
|
|
timeout=get_async_test_timeout(),
|
||
|
|
)
|
||
|
|
|
||
|
|
def get_httpserver_options(self) -> Dict[str, Any]:
|
||
|
|
"""May be overridden by subclasses to return additional
|
||
|
|
keyword arguments for the server.
|
||
|
|
"""
|
||
|
|
return {}
|
||
|
|
|
||
|
|
def get_http_port(self) -> int:
|
||
|
|
"""Returns the port used by the server.
|
||
|
|
|
||
|
|
A new port is chosen for each test.
|
||
|
|
"""
|
||
|
|
return self.__port
|
||
|
|
|
||
|
|
def get_protocol(self) -> str:
|
||
|
|
return "http"
|
||
|
|
|
||
|
|
def get_url(self, path: str) -> str:
|
||
|
|
"""Returns an absolute url for the given path on the test server."""
|
||
|
|
return "%s://127.0.0.1:%s%s" % (self.get_protocol(), self.get_http_port(), path)
|
||
|
|
|
||
|
|
def tearDown(self) -> None:
|
||
|
|
self.http_server.stop()
|
||
|
|
self.io_loop.run_sync(
|
||
|
|
self.http_server.close_all_connections, timeout=get_async_test_timeout()
|
||
|
|
)
|
||
|
|
self.http_client.close()
|
||
|
|
del self.http_server
|
||
|
|
del self._app
|
||
|
|
super(AsyncHTTPTestCase, self).tearDown()
|
||
|
|
|
||
|
|
|
||
|
|
class AsyncHTTPSTestCase(AsyncHTTPTestCase):
|
||
|
|
"""A test case that starts an HTTPS server.
|
||
|
|
|
||
|
|
Interface is generally the same as `AsyncHTTPTestCase`.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def get_http_client(self) -> AsyncHTTPClient:
|
||
|
|
return AsyncHTTPClient(force_instance=True, defaults=dict(validate_cert=False))
|
||
|
|
|
||
|
|
def get_httpserver_options(self) -> Dict[str, Any]:
|
||
|
|
return dict(ssl_options=self.get_ssl_options())
|
||
|
|
|
||
|
|
def get_ssl_options(self) -> Dict[str, Any]:
|
||
|
|
"""May be overridden by subclasses to select SSL options.
|
||
|
|
|
||
|
|
By default includes a self-signed testing certificate.
|
||
|
|
"""
|
||
|
|
return AsyncHTTPSTestCase.default_ssl_options()
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def default_ssl_options() -> Dict[str, Any]:
|
||
|
|
# Testing keys were generated with:
|
||
|
|
# openssl req -new -keyout tornado/test/test.key \
|
||
|
|
# -out tornado/test/test.crt -nodes -days 3650 -x509
|
||
|
|
module_dir = os.path.dirname(__file__)
|
||
|
|
return dict(
|
||
|
|
certfile=os.path.join(module_dir, "test", "test.crt"),
|
||
|
|
keyfile=os.path.join(module_dir, "test", "test.key"),
|
||
|
|
)
|
||
|
|
|
||
|
|
def get_protocol(self) -> str:
|
||
|
|
return "https"
|
||
|
|
|
||
|
|
|
||
|
|
@typing.overload
|
||
|
|
def gen_test(
|
||
|
|
*, timeout: float = None
|
||
|
|
) -> Callable[[Callable[..., Union[Generator, "Coroutine"]]], Callable[..., None]]:
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
@typing.overload # noqa: F811
|
||
|
|
def gen_test(func: Callable[..., Union[Generator, "Coroutine"]]) -> Callable[..., None]:
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
def gen_test( # noqa: F811
|
||
|
|
func: Callable[..., Union[Generator, "Coroutine"]] = None, timeout: float = None
|
||
|
|
) -> Union[
|
||
|
|
Callable[..., None],
|
||
|
|
Callable[[Callable[..., Union[Generator, "Coroutine"]]], Callable[..., None]],
|
||
|
|
]:
|
||
|
|
"""Testing equivalent of ``@gen.coroutine``, to be applied to test methods.
|
||
|
|
|
||
|
|
``@gen.coroutine`` cannot be used on tests because the `.IOLoop` is not
|
||
|
|
already running. ``@gen_test`` should be applied to test methods
|
||
|
|
on subclasses of `AsyncTestCase`.
|
||
|
|
|
||
|
|
Example::
|
||
|
|
|
||
|
|
class MyTest(AsyncHTTPTestCase):
|
||
|
|
@gen_test
|
||
|
|
def test_something(self):
|
||
|
|
response = yield self.http_client.fetch(self.get_url('/'))
|
||
|
|
|
||
|
|
By default, ``@gen_test`` times out after 5 seconds. The timeout may be
|
||
|
|
overridden globally with the ``ASYNC_TEST_TIMEOUT`` environment variable,
|
||
|
|
or for each test with the ``timeout`` keyword argument::
|
||
|
|
|
||
|
|
class MyTest(AsyncHTTPTestCase):
|
||
|
|
@gen_test(timeout=10)
|
||
|
|
def test_something_slow(self):
|
||
|
|
response = yield self.http_client.fetch(self.get_url('/'))
|
||
|
|
|
||
|
|
Note that ``@gen_test`` is incompatible with `AsyncTestCase.stop`,
|
||
|
|
`AsyncTestCase.wait`, and `AsyncHTTPTestCase.fetch`. Use ``yield
|
||
|
|
self.http_client.fetch(self.get_url())`` as shown above instead.
|
||
|
|
|
||
|
|
.. versionadded:: 3.1
|
||
|
|
The ``timeout`` argument and ``ASYNC_TEST_TIMEOUT`` environment
|
||
|
|
variable.
|
||
|
|
|
||
|
|
.. versionchanged:: 4.0
|
||
|
|
The wrapper now passes along ``*args, **kwargs`` so it can be used
|
||
|
|
on functions with arguments.
|
||
|
|
|
||
|
|
"""
|
||
|
|
if timeout is None:
|
||
|
|
timeout = get_async_test_timeout()
|
||
|
|
|
||
|
|
def wrap(f: Callable[..., Union[Generator, "Coroutine"]]) -> Callable[..., None]:
|
||
|
|
# Stack up several decorators to allow us to access the generator
|
||
|
|
# object itself. In the innermost wrapper, we capture the generator
|
||
|
|
# and save it in an attribute of self. Next, we run the wrapped
|
||
|
|
# function through @gen.coroutine. Finally, the coroutine is
|
||
|
|
# wrapped again to make it synchronous with run_sync.
|
||
|
|
#
|
||
|
|
# This is a good case study arguing for either some sort of
|
||
|
|
# extensibility in the gen decorators or cancellation support.
|
||
|
|
@functools.wraps(f)
|
||
|
|
def pre_coroutine(self, *args, **kwargs):
|
||
|
|
# type: (AsyncTestCase, *Any, **Any) -> Union[Generator, Coroutine]
|
||
|
|
# Type comments used to avoid pypy3 bug.
|
||
|
|
result = f(self, *args, **kwargs)
|
||
|
|
if isinstance(result, Generator) or inspect.iscoroutine(result):
|
||
|
|
self._test_generator = result
|
||
|
|
else:
|
||
|
|
self._test_generator = None
|
||
|
|
return result
|
||
|
|
|
||
|
|
if inspect.iscoroutinefunction(f):
|
||
|
|
coro = pre_coroutine
|
||
|
|
else:
|
||
|
|
coro = gen.coroutine(pre_coroutine)
|
||
|
|
|
||
|
|
@functools.wraps(coro)
|
||
|
|
def post_coroutine(self, *args, **kwargs):
|
||
|
|
# type: (AsyncTestCase, *Any, **Any) -> None
|
||
|
|
try:
|
||
|
|
return self.io_loop.run_sync(
|
||
|
|
functools.partial(coro, self, *args, **kwargs), timeout=timeout
|
||
|
|
)
|
||
|
|
except TimeoutError as e:
|
||
|
|
# run_sync raises an error with an unhelpful traceback.
|
||
|
|
# If the underlying generator is still running, we can throw the
|
||
|
|
# exception back into it so the stack trace is replaced by the
|
||
|
|
# point where the test is stopped. The only reason the generator
|
||
|
|
# would not be running would be if it were cancelled, which means
|
||
|
|
# a native coroutine, so we can rely on the cr_running attribute.
|
||
|
|
if self._test_generator is not None and getattr(
|
||
|
|
self._test_generator, "cr_running", True
|
||
|
|
):
|
||
|
|
self._test_generator.throw(type(e), e)
|
||
|
|
# In case the test contains an overly broad except
|
||
|
|
# clause, we may get back here.
|
||
|
|
# Coroutine was stopped or didn't raise a useful stack trace,
|
||
|
|
# so re-raise the original exception which is better than nothing.
|
||
|
|
raise
|
||
|
|
|
||
|
|
return post_coroutine
|
||
|
|
|
||
|
|
if func is not None:
|
||
|
|
# Used like:
|
||
|
|
# @gen_test
|
||
|
|
# def f(self):
|
||
|
|
# pass
|
||
|
|
return wrap(func)
|
||
|
|
else:
|
||
|
|
# Used like @gen_test(timeout=10)
|
||
|
|
return wrap
|
||
|
|
|
||
|
|
|
||
|
|
# Without this attribute, nosetests will try to run gen_test as a test
|
||
|
|
# anywhere it is imported.
|
||
|
|
gen_test.__test__ = False # type: ignore
|
||
|
|
|
||
|
|
|
||
|
|
class ExpectLog(logging.Filter):
|
||
|
|
"""Context manager to capture and suppress expected log output.
|
||
|
|
|
||
|
|
Useful to make tests of error conditions less noisy, while still
|
||
|
|
leaving unexpected log entries visible. *Not thread safe.*
|
||
|
|
|
||
|
|
The attribute ``logged_stack`` is set to ``True`` if any exception
|
||
|
|
stack trace was logged.
|
||
|
|
|
||
|
|
Usage::
|
||
|
|
|
||
|
|
with ExpectLog('tornado.application', "Uncaught exception"):
|
||
|
|
error_response = self.fetch("/some_page")
|
||
|
|
|
||
|
|
.. versionchanged:: 4.3
|
||
|
|
Added the ``logged_stack`` attribute.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
logger: Union[logging.Logger, basestring_type],
|
||
|
|
regex: str,
|
||
|
|
required: bool = True,
|
||
|
|
) -> None:
|
||
|
|
"""Constructs an ExpectLog context manager.
|
||
|
|
|
||
|
|
:param logger: Logger object (or name of logger) to watch. Pass
|
||
|
|
an empty string to watch the root logger.
|
||
|
|
:param regex: Regular expression to match. Any log entries on
|
||
|
|
the specified logger that match this regex will be suppressed.
|
||
|
|
:param required: If true, an exception will be raised if the end of
|
||
|
|
the ``with`` statement is reached without matching any log entries.
|
||
|
|
"""
|
||
|
|
if isinstance(logger, basestring_type):
|
||
|
|
logger = logging.getLogger(logger)
|
||
|
|
self.logger = logger
|
||
|
|
self.regex = re.compile(regex)
|
||
|
|
self.required = required
|
||
|
|
self.matched = False
|
||
|
|
self.logged_stack = False
|
||
|
|
|
||
|
|
def filter(self, record: logging.LogRecord) -> bool:
|
||
|
|
if record.exc_info:
|
||
|
|
self.logged_stack = True
|
||
|
|
message = record.getMessage()
|
||
|
|
if self.regex.match(message):
|
||
|
|
self.matched = True
|
||
|
|
return False
|
||
|
|
return True
|
||
|
|
|
||
|
|
def __enter__(self) -> "ExpectLog":
|
||
|
|
self.logger.addFilter(self)
|
||
|
|
return self
|
||
|
|
|
||
|
|
def __exit__(
|
||
|
|
self,
|
||
|
|
typ: "Optional[Type[BaseException]]",
|
||
|
|
value: Optional[BaseException],
|
||
|
|
tb: Optional[TracebackType],
|
||
|
|
) -> None:
|
||
|
|
self.logger.removeFilter(self)
|
||
|
|
if not typ and self.required and not self.matched:
|
||
|
|
raise Exception("did not get expected log message")
|
||
|
|
|
||
|
|
|
||
|
|
def main(**kwargs: Any) -> None:
|
||
|
|
"""A simple test runner.
|
||
|
|
|
||
|
|
This test runner is essentially equivalent to `unittest.main` from
|
||
|
|
the standard library, but adds support for Tornado-style option
|
||
|
|
parsing and log formatting. It is *not* necessary to use this
|
||
|
|
`main` function to run tests using `AsyncTestCase`; these tests
|
||
|
|
are self-contained and can run with any test runner.
|
||
|
|
|
||
|
|
The easiest way to run a test is via the command line::
|
||
|
|
|
||
|
|
python -m tornado.testing tornado.test.web_test
|
||
|
|
|
||
|
|
See the standard library ``unittest`` module for ways in which
|
||
|
|
tests can be specified.
|
||
|
|
|
||
|
|
Projects with many tests may wish to define a test script like
|
||
|
|
``tornado/test/runtests.py``. This script should define a method
|
||
|
|
``all()`` which returns a test suite and then call
|
||
|
|
`tornado.testing.main()`. Note that even when a test script is
|
||
|
|
used, the ``all()`` test suite may be overridden by naming a
|
||
|
|
single test on the command line::
|
||
|
|
|
||
|
|
# Runs all tests
|
||
|
|
python -m tornado.test.runtests
|
||
|
|
# Runs one test
|
||
|
|
python -m tornado.test.runtests tornado.test.web_test
|
||
|
|
|
||
|
|
Additional keyword arguments passed through to ``unittest.main()``.
|
||
|
|
For example, use ``tornado.testing.main(verbosity=2)``
|
||
|
|
to show many test details as they are run.
|
||
|
|
See http://docs.python.org/library/unittest.html#unittest.main
|
||
|
|
for full argument list.
|
||
|
|
|
||
|
|
.. versionchanged:: 5.0
|
||
|
|
|
||
|
|
This function produces no output of its own; only that produced
|
||
|
|
by the `unittest` module (previously it would add a PASS or FAIL
|
||
|
|
log message).
|
||
|
|
"""
|
||
|
|
from tornado.options import define, options, parse_command_line
|
||
|
|
|
||
|
|
define(
|
||
|
|
"exception_on_interrupt",
|
||
|
|
type=bool,
|
||
|
|
default=True,
|
||
|
|
help=(
|
||
|
|
"If true (default), ctrl-c raises a KeyboardInterrupt "
|
||
|
|
"exception. This prints a stack trace but cannot interrupt "
|
||
|
|
"certain operations. If false, the process is more reliably "
|
||
|
|
"killed, but does not print a stack trace."
|
||
|
|
),
|
||
|
|
)
|
||
|
|
|
||
|
|
# support the same options as unittest's command-line interface
|
||
|
|
define("verbose", type=bool)
|
||
|
|
define("quiet", type=bool)
|
||
|
|
define("failfast", type=bool)
|
||
|
|
define("catch", type=bool)
|
||
|
|
define("buffer", type=bool)
|
||
|
|
|
||
|
|
argv = [sys.argv[0]] + parse_command_line(sys.argv)
|
||
|
|
|
||
|
|
if not options.exception_on_interrupt:
|
||
|
|
signal.signal(signal.SIGINT, signal.SIG_DFL)
|
||
|
|
|
||
|
|
if options.verbose is not None:
|
||
|
|
kwargs["verbosity"] = 2
|
||
|
|
if options.quiet is not None:
|
||
|
|
kwargs["verbosity"] = 0
|
||
|
|
if options.failfast is not None:
|
||
|
|
kwargs["failfast"] = True
|
||
|
|
if options.catch is not None:
|
||
|
|
kwargs["catchbreak"] = True
|
||
|
|
if options.buffer is not None:
|
||
|
|
kwargs["buffer"] = True
|
||
|
|
|
||
|
|
if __name__ == "__main__" and len(argv) == 1:
|
||
|
|
print("No tests specified", file=sys.stderr)
|
||
|
|
sys.exit(1)
|
||
|
|
# In order to be able to run tests by their fully-qualified name
|
||
|
|
# on the command line without importing all tests here,
|
||
|
|
# module must be set to None. Python 3.2's unittest.main ignores
|
||
|
|
# defaultTest if no module is given (it tries to do its own
|
||
|
|
# test discovery, which is incompatible with auto2to3), so don't
|
||
|
|
# set module if we're not asking for a specific test.
|
||
|
|
if len(argv) > 1:
|
||
|
|
unittest.main(module=None, argv=argv, **kwargs) # type: ignore
|
||
|
|
else:
|
||
|
|
unittest.main(defaultTest="all", argv=argv, **kwargs)
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
main()
|