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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.
import fixtures
class SleepFixture(fixtures.Fixture):
"""A fixture for mocking the ``wait()`` within :doc:`loopingcall` events.
This exists so test cases can exercise code that uses :doc:`loopingcall`
without actually incurring wall clock time for sleeping.
The mock for the ``wait()`` is accessible via the fixture's ``mock_wait``
attribute.
.. note:: It is not recommended to assert specific arguments (i.e. timeout
values) to the mock, as this relies on the internals of
:doc:`loopingcall` not changing.
.. todo:: Figure out a way to make an enforceable contract allowing
verification of timeout values.
Example usage::
from oslo.service import fixture
...
class MyTest(...):
def setUp(self):
...
self.sleepfx = self.useFixture(fixture.SleepFixture())
...
def test_this(self):
...
thing_that_hits_a_loopingcall()
...
self.assertEqual(5, self.sleepfx.mock_wait.call_count)
...
"""
def _setUp(self):
# Provide access to the mock so that calls to it can be asserted
self.mock_wait = self.useFixture(fixtures.MockPatch(
'oslo_utils.eventletutils.EventletEvent.wait')).mock
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