diff --git a/dialogflow-cx/detect_intent_audio.js b/dialogflow-cx/detect-intent-audio.js
similarity index 93%
rename from dialogflow-cx/detect_intent_audio.js
rename to dialogflow-cx/detect-intent-audio.js
index f81f62fd2f..a389c00fc8 100644
--- a/dialogflow-cx/detect_intent_audio.js
+++ b/dialogflow-cx/detect-intent-audio.js
@@ -37,6 +37,11 @@ async function main(
 
   // Imports the Google Cloud Some API library
   const {SessionsClient} = require('@google-cloud/dialogflow-cx');
+  /**
+   * Example for regional endpoint:
+   *   const location = 'us-central1'
+   *   const client = new SessionsClient({apiEndpoint: 'us-central1-dialogflow.googleapis.com'})
+   */
   const client = new SessionsClient();
 
   const fs = require('fs');
diff --git a/dialogflow-cx/detect_intent_streaming.js b/dialogflow-cx/detect-intent-streaming.js
similarity index 95%
rename from dialogflow-cx/detect_intent_streaming.js
rename to dialogflow-cx/detect-intent-streaming.js
index ce0702c928..d8fd52e67b 100644
--- a/dialogflow-cx/detect_intent_streaming.js
+++ b/dialogflow-cx/detect-intent-streaming.js
@@ -37,6 +37,11 @@ async function main(
 
   // Imports the Google Cloud Some API library
   const {SessionsClient} = require('@google-cloud/dialogflow-cx');
+  /**
+   * Example for regional endpoint:
+   *   const location = 'us-central1'
+   *   const client = new SessionsClient({apiEndpoint: 'us-central1-dialogflow.googleapis.com'})
+   */
   const client = new SessionsClient();
 
   const fs = require('fs');
diff --git a/dialogflow-cx/detect_intent_text.js b/dialogflow-cx/detect-intent-text.js
similarity index 91%
rename from dialogflow-cx/detect_intent_text.js
rename to dialogflow-cx/detect-intent-text.js
index f571845d97..705cf56038 100644
--- a/dialogflow-cx/detect_intent_text.js
+++ b/dialogflow-cx/detect-intent-text.js
@@ -22,11 +22,16 @@ async function main(projectId, location, agentId, query, languageCode) {
   // const projectId = 'my-project';
   // const location = 'global';
   // const agentId = 'my-agent';
-  // const query = ['Hello'];
+  // const query = 'Hello';
   // const languageCode = 'en'
 
   // Imports the Google Cloud Some API library
   const {SessionsClient} = require('@google-cloud/dialogflow-cx');
+  /**
+   * Example for regional endpoint:
+   *   const location = 'us-central1'
+   *   const client = new SessionsClient({apiEndpoint: 'us-central1-dialogflow.googleapis.com'})
+   */
   const client = new SessionsClient();
 
   async function detectIntentText() {
diff --git a/dialogflow-cx/list-intents.js b/dialogflow-cx/list-intents.js
index 29551a6301..f28ec20755 100644
--- a/dialogflow-cx/list-intents.js
+++ b/dialogflow-cx/list-intents.js
@@ -25,6 +25,11 @@ async function main(projectId, location, agentId) {
 
   // Imports the Google Cloud Some API library
   const {IntentsClient} = require('@google-cloud/dialogflow-cx');
+  /**
+   * Example for regional endpoint:
+   *   const location = 'us-central1'
+   *   const client = new SessionsClient({apiEndpoint: 'us-central1-dialogflow.googleapis.com'})
+   */
   const client = new IntentsClient();
 
   async function listIntents() {
diff --git a/dialogflow-cx/quickstart.js b/dialogflow-cx/quickstart.js
index 20fb0df973..4e7efe3c31 100644
--- a/dialogflow-cx/quickstart.js
+++ b/dialogflow-cx/quickstart.js
@@ -37,6 +37,11 @@ async function main(
 
   // Imports the Google Cloud Some API library
   const {SessionsClient} = require('@google-cloud/dialogflow-cx');
+  /**
+   * Example for regional endpoint:
+   *   const location = 'us-central1'
+   *   const client = new SessionsClient({apiEndpoint: 'us-central1-dialogflow.googleapis.com'})
+   */
   const client = new SessionsClient();
 
   const fs = require('fs');
diff --git a/dialogflow-cx/resources/book_a_room.wav b/dialogflow-cx/resources/book_a_room.wav
new file mode 100644
index 0000000000..9124e92794
Binary files /dev/null and b/dialogflow-cx/resources/book_a_room.wav differ
diff --git a/dialogflow-cx/test/detect-intent-audio.test.js b/dialogflow-cx/test/detect-intent-audio.test.js
new file mode 100644
index 0000000000..01157cc132
--- /dev/null
+++ b/dialogflow-cx/test/detect-intent-audio.test.js
@@ -0,0 +1,39 @@
+// Copyright 2020 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.
+
+'use strict';
+
+const {assert} = require('chai');
+const {describe, it} = require('mocha');
+const execSync = require('child_process').execSync;
+const exec = cmd => execSync(cmd, {encoding: 'utf8'});
+
+describe('detect intent with text input', () => {
+  const cmd = 'node detect-intent-audio.js';
+
+  const projectId = process.env.GCLOUD_PROJECT;
+  const location = 'global';
+  const agentId = '5d23f659-cd71-43e9-8fb2-b69cd9896370';
+  const audioFileName = 'resources/book_a_room.wav';
+  const encoding = 'AUDIO_ENCODING_LINEAR_16';
+  const sampleRateHertz = 16000;
+  const languageCode = 'en';
+
+  it('should response to "book a room"', async () => {
+    const output = exec(
+      `${cmd} ${projectId} ${location} ${agentId} ${audioFileName} ${encoding} ${sampleRateHertz} ${languageCode}`
+    );
+    assert.include(output, "Sorry, I didn't get that. Can you rephrase?");
+  });
+});
diff --git a/dialogflow-cx/test/detect-intent-text.test.js b/dialogflow-cx/test/detect-intent-text.test.js
new file mode 100644
index 0000000000..88b3db6101
--- /dev/null
+++ b/dialogflow-cx/test/detect-intent-text.test.js
@@ -0,0 +1,43 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+const {assert} = require('chai');
+const {describe, it} = require('mocha');
+const execSync = require('child_process').execSync;
+const exec = cmd => execSync(cmd, {encoding: 'utf8'});
+
+describe('detect intent with text input', () => {
+  const cmd = 'node detect-intent-text.js';
+
+  const projectId = process.env.GCLOUD_PROJECT;
+  const location = 'global';
+  const agentId = '5d23f659-cd71-43e9-8fb2-b69cd9896370';
+  const languageCode = 'en';
+
+  it('should response to "hello"', async () => {
+    const output = exec(
+      `${cmd} ${projectId} ${location} ${agentId} 'hello' ${languageCode}`
+    );
+    assert.include(output, 'How can I assist you today?');
+  });
+
+  it('should response to "reserve a vent"', async () => {
+    const output = exec(
+      `${cmd} ${projectId} ${location} ${agentId} 'i need to reserve a van' ${languageCode}`
+    );
+    assert.include(output, 'Where would you like to pick it up?');
+  });
+});
diff --git a/dialogflow-cx/test/list-intents.test.js b/dialogflow-cx/test/list-intents.test.js
new file mode 100644
index 0000000000..e8ede3d84a
--- /dev/null
+++ b/dialogflow-cx/test/list-intents.test.js
@@ -0,0 +1,34 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+const {assert} = require('chai');
+const {describe, it} = require('mocha');
+const execSync = require('child_process').execSync;
+const exec = cmd => execSync(cmd, {encoding: 'utf8'});
+
+describe('list intents', () => {
+  const cmd = 'node list-intents.js';
+
+  const projectId = process.env.GCLOUD_PROJECT;
+  const location = 'global';
+  const agentId = '5d23f659-cd71-43e9-8fb2-b69cd9896370';
+
+  it('should List the Intents', async () => {
+    const output = exec(`${cmd} ${projectId} ${location} ${agentId}`);
+    assert.include(output, 'Default Welcome Intent');
+    assert.include(output, 'Default Negative Intent');
+  });
+});