docs(samples): add set agent code sample (#370)

* Added Update Intent Snippet and Test

* Deleted Setting Env Vars

* Fixed Lint Issues

* Fixed Lint and Build Issue

* Fixed Build Issue

* Changed tests to pytests

* Removed delete and create agent from test

* Fixed Import Order

* Deleted unused import

* Removed Language from update_intent Snippet

* Added copyright

* Changed intent name to random name

* delete intent after testing

* fix test

* remove contains

* Added Create Intent

* fix lint

* docs(samples): add set agent code sample

* lint fix

* Resolved comments

* test and lint changes

* Added Comments

* lint fix

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

samples/snippets/set_agent.py

@@ -0,0 +1,39 @@
+# Copyright 2021 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.
+
+# [START dialogflow_set_agent_sample]
+
+from google.cloud.dialogflow_v2 import Agent
+from google.cloud.dialogflow_v2 import AgentsClient
+
+
+def set_agent(project_id, display_name):
+
+    agents_client = AgentsClient()
+
+    parent = agents_client.common_project_path(project_id)
+
+    agent = Agent(
+        parent=parent,
+        display_name=display_name,
+        default_language_code="en",
+        time_zone="America/Los_Angeles",
+    )
+
+    response = agents_client.set_agent(request={"agent": agent})
+
+    return response
+
+
+# [END dialogflow_set_agent_sample]

samples/snippets/set_agent_test.py

@@ -0,0 +1,31 @@
+# Copyright 2021 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
+#
+#     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 os
+
+from google.api_core.exceptions import InvalidArgument
+
+import pytest
+
+from set_agent import set_agent
+
+PROJECT_ID = os.getenv("GOOGLE_CLOUD_PROJECT")
+
+
+# We cannot test setAgent because Dialogflow ES can only have one agent
+# and if we create a agent it will delete the exisitng testing agent and
+# would cause all tests to fail
+def test_set_agent():
+    with pytest.raises(InvalidArgument):
+        set_agent(PROJECT_ID, "")