Fix broken lower-constraints job

Despite no Flask update on stable branches, the lower-constraints job is
broken similarly to when Flask was bumped to 2.0.1. The broken test
cases were mocking the root object "flask.request".

Instead of mocking the root object, we address the issue by mocking only
the needed methods and attributes. This facilitates the understanding of
the unit test, and also helps people to pin-point problems right away.

Change-Id: I8703c7d3e69f35ef3e85234c27b4743242111f3d
(cherry picked from commit 885c9f077f)

cloudkitty/api/app.py

@@ -20,11 +20,8 @@ import flask_restful
 from oslo_config import cfg
 from oslo_log import log
 from paste import deploy
-try:
-    from werkzeug.middleware import dispatcher
-# In case we have werkzeug<0.15
-except ImportError:
-    from werkzeug import wsgi as dispatcher
+
+from werkzeug.middleware import dispatcher
 
 from cloudkitty.api import root as api_root
 from cloudkitty.api.v1 import get_api_app as get_v1_app

cloudkitty/tests/api/v2/dataframes/test_dataframes.py

@@ -12,6 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 #
+import flask
+
 from unittest import mock
 
 from cloudkitty.api.v2.dataframes import dataframes
@@ -28,12 +30,15 @@ class TestDataframeListEndpoint(tests.TestCase):
 
     def test_non_admin_request_is_filtered_on_project_id(self):
         policy_mock = mock.patch('cloudkitty.common.policy.authorize')
+
+        flask.request.context = mock.Mock()
+        flask.request.context.project_id = 'test-project'
+        flask.request.context.is_admin = False
+
         with mock.patch.object(self.endpoint._storage, 'retrieve') as ret_mock:
-            with policy_mock, mock.patch('flask.request') as fmock:
+            with policy_mock, mock.patch('flask.request.args.lists') as fmock:
                 ret_mock.return_value = {'total': 42, 'dataframes': []}
-                fmock.args.lists.return_value = []
-                fmock.context.is_admin = False
-                fmock.context.project_id = 'test-project'
+                fmock.return_value = []
                 self.endpoint.get()
                 ret_mock.assert_called_once_with(
                     begin=tzutils.get_month_start(),

cloudkitty/tests/api/v2/summary/test_summary.py

@@ -12,6 +12,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 #
+import flask
+import uuid
+
 from unittest import mock
 
 from cloudkitty.api.v2.summary import summary
@@ -28,10 +31,15 @@ class TestSummaryEndpoint(tests.TestCase):
 
     def test_type_filter_is_passed_separately(self):
         policy_mock = mock.patch('cloudkitty.common.policy.authorize')
+
+        flask.request.context = mock.Mock()
+        flask.request.context.project_id = str(uuid.uuid4())
+        flask.request.context.is_admin = True
+
         with mock.patch.object(self.endpoint._storage, 'total') as total_mock:
-            with policy_mock, mock.patch('flask.request') as fmock:
+            with policy_mock, mock.patch('flask.request.args.lists') as fmock:
                 total_mock.return_value = {'total': 0, 'results': []}
-                fmock.args.lists.return_value = [
+                fmock.return_value = [
                     ('filters', 'a:b,type:awesome')]
                 self.endpoint.get()
                 total_mock.assert_called_once_with(

cloudkitty/tests/api/v2/test_utils.py

@@ -243,12 +243,12 @@ class AddInputSchemaTest(tests.TestCase):
         self.assertEqual(
             list(test_func.input_schema.schema.keys())[0], 'arg_one')
 
-        with mock.patch('flask.request') as m:
-            m.get_json.return_value = {}
+        with mock.patch('flask.request.get_json') as m:
+            m.return_value = {}
             test_func(self)
 
-        with mock.patch('flask.request') as m:
-            m.get_json.return_value = {'arg_one': 'one'}
+        with mock.patch('flask.request.get_json') as m:
+            m.return_value = {'arg_one': 'one'}
             test_func(self)
 
     def _test_multiple_add_input_schema_x(self, location):