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import logging
import unittest
from contextlib import contextmanager
from typing import Dict
import discord
from discord.ext import commands
from bot.log import get_logger
from tests import helpers
class _CaptureLogHandler(logging.Handler):
"""
A logging handler capturing all (raw and formatted) logging output.
"""
def __init__(self):
super().__init__()
self.records = []
def emit(self, record):
self.records.append(record)
class LoggingTestsMixin:
"""
A mixin that defines additional test methods for logging behavior.
This mixin relies on the availability of the `fail` attribute defined by the
test classes included in Python's unittest method to signal test failure.
"""
@contextmanager
def assertNotLogs(self, logger=None, level=None, msg=None): # noqa: N802
"""
Asserts that no logs of `level` and higher were emitted by `logger`.
You can specify a specific `logger`, the minimum `logging` level we want to watch and a
custom `msg` to be added to the `AssertionError` if thrown. If the assertion fails, the
recorded log records will be outputted with the `AssertionError` message. The context
manager does not yield a live `look` into the logging records, since we use this context
manager when we're testing under the assumption that no log records will be emitted.
"""
if not isinstance(logger, logging.Logger):
logger = get_logger(logger)
if level:
level = logging._nameToLevel.get(level, level)
else:
level = logging.INFO
handler = _CaptureLogHandler()
old_handlers = logger.handlers[:]
old_level = logger.level
old_propagate = logger.propagate
logger.handlers = [handler]
logger.setLevel(level)
logger.propagate = False
try:
yield
except Exception as exc:
raise exc
finally:
logger.handlers = old_handlers
logger.propagate = old_propagate
logger.setLevel(old_level)
if handler.records:
level_name = logging.getLevelName(level)
n_logs = len(handler.records)
base_message = f"{n_logs} logs of {level_name} or higher were triggered on {logger.name}:\n"
records = [str(record) for record in handler.records]
record_message = "\n".join(records)
standard_message = self._truncateMessage(base_message, record_message)
msg = self._formatMessage(msg, standard_message)
self.fail(msg)
class CommandTestCase(unittest.IsolatedAsyncioTestCase):
"""TestCase with additional assertions that are useful for testing Discord commands."""
async def assertHasPermissionsCheck( # noqa: N802
self,
cmd: commands.Command,
permissions: Dict[str, bool],
) -> None:
"""
Test that `cmd` raises a `MissingPermissions` exception if author lacks `permissions`.
Every permission in `permissions` is expected to be reported as missing. In other words, do
not include permissions which should not raise an exception along with those which should.
"""
# Invert permission values because it's more intuitive to pass to this assertion the same
# permissions as those given to the check decorator.
permissions = {k: not v for k, v in permissions.items()}
ctx = helpers.MockContext()
ctx.channel.permissions_for.return_value = discord.Permissions(**permissions)
with self.assertRaises(commands.MissingPermissions) as cm:
await cmd.can_run(ctx)
self.assertCountEqual(permissions.keys(), cm.exception.missing_permissions)
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