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#
# 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.
"""Manage fixtures for gabbi at the test suite level."""
import contextlib
import sys
from unittest import case
class GabbiFixtureError(Exception):
"""Generic exception for GabbiFixture."""
pass
class GabbiFixture:
"""A context manager that operates as a fixture.
Subclasses must implement ``start_fixture`` and ``stop_fixture``, each
of which contain the logic for stopping and starting whatever the
fixture is. What a fixture is is left as an exercise for the implementor.
These context managers will be nested so any actual work needs to
happen in ``start_fixture`` and ``stop_fixture`` and not in ``__init__``.
Otherwise exception handling will not work properly.
"""
def __init__(self):
self.exc_type = None
self.exc_value = None
self.traceback = None
def __enter__(self):
self.start_fixture()
def __exit__(self, exc_type, value, traceback):
self.exc_type = exc_type
self.exc_value = value
self.traceback = traceback
self.stop_fixture()
def start_fixture(self):
"""Implement the actual workings of starting the fixture here."""
pass
def stop_fixture(self):
"""Implement the actual workings of stopping the fixture here."""
pass
class SkipAllFixture(GabbiFixture):
"""A fixture that skips all the tests in the current suite."""
def start_fixture(self):
raise case.SkipTest('entire suite skipped')
@contextlib.contextmanager
def nest(fixtures):
"""Nest a series of fixtures.
This is duplicated from ``nested`` in the stdlib, which has been
deprecated because of issues with how exceptions are difficult to
handle during ``__init__``. Gabbi needs to nest an unknown number
of fixtures dynamically, so the ``with`` syntax that replaces
``nested`` will not work.
"""
contexts = []
exits = []
exc = (None, None, None)
try:
for fixture in fixtures:
enter_func = fixture.__enter__
exit_func = fixture.__exit__
contexts.append(enter_func())
exits.append(exit_func)
yield contexts
except Exception:
exc = sys.exc_info()
finally:
while exits:
exit_func = exits.pop()
try:
if exit_func(*exc):
exc = (None, None, None)
except Exception:
exc = sys.exc_info()
if exc != (None, None, None):
raise exc[1].with_traceback(exc[2])
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