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# Copyright 2015, Google, Inc.
# 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.
#
"""
Common testing utilities between samples
"""
import contextlib
import os
import sys
import tempfile
import unittest
from nose.plugins.skip import SkipTest
from six.moves import cStringIO
try:
APPENGINE_AVAILABLE = True
from google.appengine.datastore import datastore_stub_util
from google.appengine.ext import testbed
from google.appengine.api import namespace_manager
except ImportError:
APPENGINE_AVAILABLE = False
RESOURCE_PATH = os.path.join(
os.path.abspath(os.path.dirname(__file__)), 'resources')
PROJECT_ID_ENV_VAR = 'TEST_PROJECT_ID'
BUCKET_NAME_ENV_VAR = 'TEST_BUCKET_NAME'
class CloudBaseTest(unittest.TestCase):
def setUp(self):
self.resource_path = RESOURCE_PATH
self.project_id = os.environ.get(PROJECT_ID_ENV_VAR)
if not self.project_id:
raise EnvironmentError(
'You must set the {} environment variable to a valid Google '
'Cloud project ID.'.format(PROJECT_ID_ENV_VAR))
self.bucket_name = os.environ.get(BUCKET_NAME_ENV_VAR)
if not self.bucket_name:
raise EnvironmentError(
'You must set the {} environment variable to a valid Google '
'Cloud Storage bucket.'.format(BUCKET_NAME_ENV_VAR))
class AppEngineTestbedCase(CloudBaseTest):
"""A base test case for common setup/teardown tasks for test."""
def setUp(self):
super(AppEngineTestbedCase, self).setUp()
if not APPENGINE_AVAILABLE:
raise SkipTest()
# A hack to prevent get_application_default from going GAE route.
self._server_software_org = os.environ.get('SERVER_SOFTWARE')
os.environ['SERVER_SOFTWARE'] = ''
# Setup the datastore and memcache stub.
# First, create an instance of the Testbed class.
self.testbed = testbed.Testbed()
# Then activate the testbed, which prepares the service stubs for
# use.
self.testbed.activate()
# Create a consistency policy that will simulate the High
# Replication consistency model.
self.policy = datastore_stub_util.PseudoRandomHRConsistencyPolicy(
probability=0)
# Initialize the datastore stub with this policy.
self.testbed.init_datastore_v3_stub(
datastore_file=tempfile.mkstemp()[1],
consistency_policy=self.policy)
self.testbed.init_memcache_stub()
# Setup remaining stubs.
self.testbed.init_user_stub()
self.testbed.init_taskqueue_stub(root_path='tests/resources')
self.taskqueue_stub = self.testbed.get_stub(
testbed.TASKQUEUE_SERVICE_NAME)
def tearDown(self):
super(AppEngineTestbedCase, self).tearDown()
if self._server_software_org:
os.environ['SERVER_SOFTWARE'] = self._server_software_org
self.testbed.deactivate()
def loginUser(self, email='user@example.com', id='123', is_admin=False):
self.testbed.setup_env(
user_email=email,
user_id=id,
user_is_admin='1' if is_admin else '0',
overwrite=True)
def runTasks(self):
tasks = self.taskqueue_stub.get_filtered_tasks()
for task in tasks:
namespace = task.headers.get('X-AppEngine-Current-Namespace', '')
previous_namespace = namespace_manager.get_namespace()
try:
namespace_manager.set_namespace(namespace)
self.app.post(
task.url,
task.extract_params(),
headers={
k: v for k, v in task.headers.iteritems()
if k.startswith('X-AppEngine')})
finally:
namespace_manager.set_namespace(previous_namespace)
@contextlib.contextmanager
def capture_stdout():
"""Capture stdout to a StringIO object."""
fake_stdout = cStringIO()
old_stdout = sys.stdout
try:
sys.stdout = fake_stdout
yield fake_stdout
finally:
sys.stdout = old_stdout