docs(samples): added filter sample (#171)

* docs(samples): added filter sample

* lint fix

* removed pytest variables

* update test id

* Update samples/snippets/list_testcase_results_test.py

Co-authored-by: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>

* Revised Code

* fixed failing test

* lint fix

* lint fix

* lint fix

* Update samples/snippets/list_testcase_results.py

Co-authored-by: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>

Co-authored-by: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>

samples/snippets/list_testcase_results.py

@@ -0,0 +1,35 @@
+# 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_list_test_case_results_sample]
+
+from google.cloud.dialogflowcx_v3.services.test_cases.client import TestCasesClient
+from google.cloud.dialogflowcx_v3.types.test_case import ListTestCaseResultsRequest
+
+
+def list_test_case(project_id, agent_id, test_id, location):
+
+    req = ListTestCaseResultsRequest()
+    req.parent = f"projects/{project_id}/locations/{location}/agents/{agent_id}/testCases/{test_id}"
+    req.filter = "environment=draft"
+    client = TestCasesClient(
+        client_options={"api_endpoint": f"{location}-dialogflow.googleapis.com"}
+    )
+    # Makes a call to list all test case results that match filter
+    result = client.list_test_case_results(request=req)
+    print(result)
+    return result
+
+
+# [END dialogflow_list_test_case_results_sample]

samples/snippets/list_testcase_results_test.py

@@ -0,0 +1,29 @@
+# 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 google.auth
+
+from list_testcase_results import list_test_case
+
+LOCATION = "global"
+
+_, PROJECT_ID = google.auth.default()
+AGENT_ID = "143dee60-56fe-4191-a8d8-095f569f6cd8"
+TEST_ID = "3c48d39e-71c0-4cb0-b974-3d5c596d347e"
+
+
+def test_list_testcase_results():
+    result = list_test_case(PROJECT_ID, AGENT_ID, TEST_ID, LOCATION)
+
+    assert "Hello! How can I help you?" in str(result)