forked from canonical/layer-basic
/
utils.py
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/
utils.py
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# Copyright 2016 Canonical Ltd
# 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.
"""Unit test helpers from https://github.com/openstack/charms.openstack/"""
import contextlib
import io
import mock
import unittest
@contextlib.contextmanager
def patch_open():
'''Patch open() to allow mocking both open() itself and the file that is
yielded.
Yields the mock for "open" and "file", respectively.'''
mock_open = mock.MagicMock(spec=open)
mock_file = mock.MagicMock(spec=io.FileIO)
@contextlib.contextmanager
def stub_open(*args, **kwargs):
mock_open(*args, **kwargs)
yield mock_file
with mock.patch('builtins.open', stub_open):
yield mock_open, mock_file
class BaseTestCase(unittest.TestCase):
def setUp(self):
self._patches = {}
self._patches_start = {}
def tearDown(self):
for k, v in self._patches.items():
v.stop()
setattr(self, k, None)
self._patches = None
self._patches_start = None
def patch_object(self, obj, attr, return_value=None, name=None, new=None,
**kwargs):
if name is None:
name = attr
if new is not None:
mocked = mock.patch.object(obj, attr, new=new, **kwargs)
else:
mocked = mock.patch.object(obj, attr, **kwargs)
self._patches[name] = mocked
started = mocked.start()
if new is None:
started.return_value = return_value
self._patches_start[name] = started
setattr(self, name, started)
def patch(self, item, return_value=None, name=None, new=None, **kwargs):
if name is None:
raise RuntimeError("Must pass 'name' to .patch()")
if new is not None:
mocked = mock.patch(item, new=new, **kwargs)
else:
mocked = mock.patch(item, **kwargs)
self._patches[name] = mocked
started = mocked.start()
if new is None:
started.return_value = return_value
self._patches_start[name] = started
setattr(self, name, started)