Tasks: Add smoke test and correct docs/index.rst.

tasks/docs/index.rst

@@ -4,7 +4,7 @@ API Reference
 -------------
 
 This package includes clients for multiple versions of the Tasks
-API. By default, you will get ``v2beta3``, the latest version.
+API. By default, you will get ``v2``, the latest version.
 
 .. toctree::
     :maxdepth: 2
@@ -18,12 +18,18 @@ support code previously written against them. In order to use them, you
 will want to import from e.g.  ``google.cloud.tasks_v2beta3`` in lieu of
 ``google.cloud.tasks`` (or the equivalent ``google.cloud.tasks_v2``).
 
-An API and type reference is provided the this beta also:
+v2beta3:
 
 .. toctree::
     :maxdepth: 2
 
     gapic/v2beta3/api
     gapic/v2beta3/types
+
+v2beta2:
+
+.. toctree::
+    :maxdepth: 2
+
     gapic/v2beta2/api
     gapic/v2beta2/types

tasks/tests/system/gapic/v2/test_system_tasks_v2.py

@@ -0,0 +1,26 @@
+# Copyright 2019 Google LLC
+#
+# 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
+#
+#     https://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 os
+
+from google.cloud import tasks_v2
+
+
+class TestSystemTasks(object):
+    def test_list_queues(self):
+        client = tasks_v2.CloudTasksClient()
+
+        # Setup Request
+        parent = client.location_path(os.environ["PROJECT_ID"], "us-central1")
+        client.list_queues(parent)