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# Copyright 2019 PrivateStorage.io, LLC
#
# 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.
"""
Eliot testing helpers.
"""
from __future__ import (
absolute_import,
)
from functools import (
wraps,
)
from unittest import (
SkipTest,
)
from eliot import (
MemoryLogger,
)
from eliot.testing import (
swap_logger,
check_for_errors,
)
# validate_logging and capture_logging copied from Eliot around 1.11. We
# can't upgrade past 1.7 because we're not Python 3 compatible.
def validate_logging(assertion, *assertionArgs, **assertionKwargs):
def decorator(function):
@wraps(function)
def wrapper(self, *args, **kwargs):
skipped = False
kwargs["logger"] = logger = MemoryLogger()
self.addCleanup(check_for_errors, logger)
# TestCase runs cleanups in reverse order, and we want this to
# run *before* tracebacks are checked:
if assertion is not None:
self.addCleanup(
lambda: skipped
or assertion(self, logger, *assertionArgs, **assertionKwargs)
)
try:
return function(self, *args, **kwargs)
except SkipTest:
skipped = True
raise
return wrapper
return decorator
def capture_logging(assertion, *assertionArgs, **assertionKwargs):
"""
Capture and validate all logging that doesn't specify a L{Logger}.
See L{validate_logging} for details on the rest of its behavior.
"""
def decorator(function):
@validate_logging(assertion, *assertionArgs, **assertionKwargs)
@wraps(function)
def wrapper(self, *args, **kwargs):
logger = kwargs["logger"]
previous_logger = swap_logger(logger)
def cleanup():
swap_logger(previous_logger)
self.addCleanup(cleanup)
return function(self, *args, **kwargs)
return wrapper
return decorator