diff --git a/.github/actions/validate/entrypoint.sh b/.github/actions/validate/entrypoint.sh
index 64d10db..714d1c5 100644
--- a/.github/actions/validate/entrypoint.sh
+++ b/.github/actions/validate/entrypoint.sh
@@ -1,3 +1,4 @@
 #!/bin/sh
 
-composer -h
+composer require
+./vendor/bin/phpunit tests
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 4ff1b5a..cad8a23 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -14,3 +14,15 @@ jobs:
       uses: actions/checkout@v2
     - name: Validate
       uses: ./.github/actions/validate
+      env:
+        USERNAME: ${{ secrets.USERNAME }}
+        PASSWORD: ${{ secrets.PASSWORD }}
+        ACCOUNT_ID: ${{ secrets.ACCOUNT_ID }}
+        VOICE_APPLICATION_ID: ${{ secrets.VOICE_APPLICATION_ID }}
+        MESSAGING_APPLICATION_ID: ${{ secrets.MESSAGING_APPLICATION_ID }}
+        VOICE_CALLBACK_URL: ${{ secrets.VOICE_CALLBACK_URL }}
+        PHONE_NUMBER_OUTBOUND: ${{ secrets.PHONE_NUMBER_OUTBOUND }}
+        PHONE_NUMBER_INBOUND: ${{ secrets.PHONE_NUMBER_INBOUND }}
+        MFA_MESSAGING_APPLICATION_ID: ${{ secrets.MFA_MESSAGING_APPLICATION_ID }}
+        MFA_VOICE_APPLICATION_ID: ${{ secrets.MFA_VOICE_APPLICATION_ID }}
+        PHONE_NUMBER_MFA: ${{ secrets.PHONE_NUMBER_MFA }}
diff --git a/composer.json b/composer.json
index 46a90bc..c744b10 100644
--- a/composer.json
+++ b/composer.json
@@ -23,13 +23,11 @@
         "apimatic/jsonmapper": "~1.3.0"
     },
     "require-dev": {
-        "squizlabs/php_codesniffer": "^2.7",
-        "phan/phan": "^1.2",
-        "phpunit/phpunit": "4.8.*"
+        "phpunit/phpunit": "^9"
     },
     "autoload": {
         "psr-4": {
             "BandwidthLib\\": "src/"
         }
     }
-}
\ No newline at end of file
+}
diff --git a/phpunit.xml b/phpunit.xml
index 5844324..560f77c 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit backupGlobals="false"
          backupStaticAttributes="false"
-         bootstrap="tests/bootstrap.php"
          colors="true"
          convertErrorsToExceptions="true"
          convertNoticesToExceptions="true"
diff --git a/tests/ApiTest.php b/tests/ApiTest.php
new file mode 100644
index 0000000..fd57197
--- /dev/null
+++ b/tests/ApiTest.php
@@ -0,0 +1,144 @@
+<?php
+
+/**
+ * ApiTest.php
+ *
+ * A simple php integration test class for API requests and responses
+ *
+ * @copyright Bandwidth INC
+ */
+
+use PHPUnit\Framework\TestCase;
+
+final class ApiTest extends TestCase
+{
+    protected $bandwidthClient;
+
+    protected function setUp(): void {
+        $config = new BandwidthLib\Configuration(
+            array(
+                'messagingBasicAuthUserName' => getenv("USERNAME"),
+                'messagingBasicAuthPassword' => getenv("PASSWORD"),
+                'voiceBasicAuthUserName' => getenv("USERNAME"),
+                'voiceBasicAuthPassword' => getenv("PASSWORD"),
+                'twoFactorAuthBasicAuthUserName' => getenv("USERNAME"),
+                'twoFactorAuthBasicAuthPassword' => getenv("PASSWORD")
+            )
+        );
+        $this->bandwidthClient = new BandwidthLib\BandwidthClient($config);
+    }
+
+    public function testCreateMessage() {
+        $body = new BandwidthLib\Messaging\Models\MessageRequest();
+        $body->from = getenv("PHONE_NUMBER_INBOUND");
+        $body->to = [getenv("PHONE_NUMBER_OUTBOUND")];
+        $body->applicationId = getenv("MESSAGING_APPLICATION_ID");
+        $body->text = "PHP Monitoring";
+
+        $response = $this->bandwidthClient->getMessaging()->getClient()->createMessage(getenv("ACCOUNT_ID"), $body);
+
+        $this->assertTrue(strlen($response->getResult()->id) > 0); //validate that _some_ id was returned
+    }
+
+    public function testCreateMessageInvalidPhoneNumber() {
+        $body = new BandwidthLib\Messaging\Models\MessageRequest();
+        $body->from = getenv("PHONE_NUMBER_INBOUND");
+        $body->to = ["+1invalid"];
+        $body->applicationId = getenv("MESSAGING_APPLICATION_ID");
+        $body->text = "PHP Monitoring";
+
+        try {
+            $this->bandwidthClient->getMessaging()->getClient()->createMessage(getenv("ACCOUNT_ID"), $body);
+            //workaround to make sure that if the above error is not raised, the build will fail
+            $this->assertTrue(false);
+        } catch (BandwidthLib\Messaging\Exceptions\MessagingException $e) {
+            $this->assertTrue(strlen($e->description) > 0);
+        }
+    }
+
+    public function testUploadDownloadMedia() {
+        //constants
+
+        $mediaFileName = "php_monitoring";
+        $mediaFile = "12345"; //todo: confirm binary string?
+        //media upload
+        $this->bandwidthClient->getMessaging()->getClient()->uploadMedia(getenv("ACCOUNT_ID"), $mediaFileName, strlen($mediaFile), $mediaFile);
+        
+        //media download
+        $downloadedMediaFile = $this->bandwidthClient->getMessaging()->getClient()->getMedia(getenv("ACCOUNT_ID"), $mediaFileName)->getResult();
+
+        //validate that response is the same
+        $this->assertEquals($downloadedMediaFile, $mediaFile);
+    }
+
+    public function testCreateCallAndGetCallState() {
+        $body = new BandwidthLib\Voice\Models\ApiCreateCallRequest();
+        $body->from = getenv("PHONE_NUMBER_INBOUND");
+        $body->to = getenv("PHONE_NUMBER_OUTBOUND");
+        $body->applicationId = getenv("VOICE_APPLICATION_ID");
+        $body->answerUrl = getenv("VOICE_CALLBACK_URL");
+        $response = $this->bandwidthClient->getVoice()->getClient()->createCall(getenv("ACCOUNT_ID"), $body);
+        $callId = $response->getResult()->callId;
+        $this->assertTrue(strlen($callId) > 0);
+
+        //get phone call information
+        $response = $this->bandwidthClient->getVoice()->getClient()->getCallState(getenv("ACCOUNT_ID"), $callId);
+        $this->assertTrue(strlen($response->getResult()->state) > 0); 
+    }
+
+    public function testCreateCallInvalidPhoneNumber() {
+        $body = new BandwidthLib\Voice\Models\ApiCreateCallRequest();
+        $body->from = getenv("PHONE_NUMBER_INBOUND");
+        $body->to = "+1invalid";
+        $body->applicationId = getenv("VOICE_APPLICATION_ID");
+        $body->answerUrl = getenv("VOICE_CALLBACK_URL");
+
+        try {
+            $this->bandwidthClient->getVoice()->getClient()->createCall(getenv("ACCOUNT_ID"), $body);
+            //workaround to make sure that if the above error is not raised, the build will fail
+            $this->assertTrue(false);
+        } catch (BandwidthLib\Voice\Exceptions\ApiErrorResponseException $e) {
+            $this->assertTrue(strlen($e->description) > 0);
+        }
+    }
+
+    public function testMfaMessaging() {
+        $body = new BandwidthLib\TwoFactorAuth\Models\TwoFactorCodeRequestSchema();
+        $body->from = getenv("PHONE_NUMBER_MFA");
+        $body->to = getenv("PHONE_NUMBER_INBOUND");
+        $body->applicationId = getenv("MFA_MESSAGING_APPLICATION_ID");
+        $body->scope = "scope";
+        $body->digits = 6;
+        $body->message = "Your temporary {NAME} {SCOPE} code is {CODE}";
+
+        $response = $this->bandwidthClient->getTwoFactorAuth()->getMFA()->createMessagingTwoFactor(getenv("ACCOUNT_ID"), $body);
+        $this->assertTrue(strlen($response->getResult()->messageId) > 0); //validate that _some_ id was returned
+    }
+
+    public function testMfaVoice() {
+        $body = new BandwidthLib\TwoFactorAuth\Models\TwoFactorCodeRequestSchema();
+        $body->from = getenv("PHONE_NUMBER_MFA");
+        $body->to = getenv("PHONE_NUMBER_INBOUND");
+        $body->applicationId = getenv("MFA_VOICE_APPLICATION_ID");
+        $body->scope = "scope";
+        $body->digits = 6;
+        $body->message = "Your temporary {NAME} {SCOPE} code is {CODE}";
+
+        $response = $this->bandwidthClient->getTwoFactorAuth()->getMFA()->createVoiceTwoFactor(getenv("ACCOUNT_ID"), $body);
+        $this->assertTrue(strlen($response->getResult()->callId) > 0); //validate that _some_ id was returned
+    }
+
+    public function testMfaVerify() {
+        $body = new BandwidthLib\TwoFactorAuth\Models\TwoFactorVerifyRequestSchema();
+        $body->from = getenv("PHONE_NUMBER_MFA");
+        $body->to = getenv("PHONE_NUMBER_INBOUND");
+        $body->applicationId = getenv("MFA_VOICE_APPLICATION_ID");
+        $body->scope = "scope";
+        $body->code = "123456";
+        $body->digits = 6;
+        $body->expirationTimeInMinutes = 3;
+
+        $response = $this->bandwidthClient->getTwoFactorAuth()->getMFA()->createVerifyTwoFactor(getenv("ACCOUNT_ID"), $body);
+        $this->assertTrue(is_bool($response->getResult()->valid));
+    }
+}
diff --git a/tests/BxmlTest.php b/tests/BxmlTest.php
new file mode 100644
index 0000000..c154d80
--- /dev/null
+++ b/tests/BxmlTest.php
@@ -0,0 +1,404 @@
+<?php
+
+/**
+ * BxmlTest.php
+ *
+ * A simple php integration test class for BXML
+ *
+ * @copyright Bandwidth INC
+ */
+
+use PHPUnit\Framework\TestCase;
+
+final class BxmlTest extends TestCase
+{
+    public function testForward() {
+        $forward = new BandwidthLib\Voice\Bxml\Forward();
+        $forward->to("+18888888888");
+        $forward->from("+18889999999");
+        $forward->callTimeout(3);
+        $forward->diversionTreatment("none");
+        $forward->diversionReason("away");
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($forward);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Forward to="+18888888888" from="+18889999999" callTimeout="3" diversionTreatment="none" diversionReason="away"/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testGatherNoNestedTag() {
+        $gather = new BandwidthLib\Voice\Bxml\Gather();
+        $gather->gatherUrl("https://test.com");
+        $gather->gatherMethod("GET");
+        $gather->username("user");
+        $gather->password("pass");
+        $gather->tag("tag");
+        $gather->terminatingDigits("123");
+        $gather->maxDigits(3);
+        $gather->interDigitTimeout(4);
+        $gather->firstDigitTimeout(5);
+        $gather->repeatCount(3);
+        $gather->gatherFallbackUrl("https://test.com");
+        $gather->gatherFallbackMethod("GET");
+        $gather->fallbackUsername("fuser");
+        $gather->fallbackPassword("fpass");
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($gather);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Gather username="user" password="pass" tag="tag" gatherUrl="https://test.com" gatherMethod="GET" terminatingDigits="123" maxDigits="3" interDigitTimeout="4" firstDigitTimeout="5" repeatCount="3" gatherFallbackUrl="https://test.com" gatherFallbackMethod="GET" fallbackUsername="fuser" fallbackPassword="fpass"/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testGatherNestedSpeakSentence() {
+        $gather = new BandwidthLib\Voice\Bxml\Gather();
+        $speakSentence = new BandwidthLib\Voice\Bxml\SpeakSentence("Test");
+        $speakSentence->voice("susan");
+        $speakSentence->locale("en_US");
+        $speakSentence->gender("female");
+        $gather = new BandwidthLib\Voice\Bxml\Gather();
+        $gather->gatherUrl("https://test.com");
+        $gather->gatherMethod("GET");
+        $gather->username("user");
+        $gather->password("pass");
+        $gather->tag("tag");
+        $gather->terminatingDigits("123");
+        $gather->maxDigits(3);
+        $gather->interDigitTimeout(4);
+        $gather->firstDigitTimeout(5);
+        $gather->speakSentence($speakSentence);
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($gather);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Gather username="user" password="pass" tag="tag" gatherUrl="https://test.com" gatherMethod="GET" terminatingDigits="123" maxDigits="3" interDigitTimeout="4" firstDigitTimeout="5"><SpeakSentence locale="en_US" gender="female" voice="susan">Test</SpeakSentence></Gather></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testGatherNestedPlayAudio() {
+        $gather = new BandwidthLib\Voice\Bxml\Gather();
+        $playAudio = new BandwidthLib\Voice\Bxml\PlayAudio("https://test.com");
+        $playAudio->username("user");
+        $playAudio->password("pass");
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $gather = new BandwidthLib\Voice\Bxml\Gather();
+        $gather->gatherUrl("https://test.com");
+        $gather->gatherMethod("GET");
+        $gather->username("user");
+        $gather->password("pass");
+        $gather->tag("tag");
+        $gather->terminatingDigits("123");
+        $gather->maxDigits(3);
+        $gather->interDigitTimeout(4);
+        $gather->firstDigitTimeout(5);
+        $gather->playAudio($playAudio);
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($gather);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Gather username="user" password="pass" tag="tag" gatherUrl="https://test.com" gatherMethod="GET" terminatingDigits="123" maxDigits="3" interDigitTimeout="4" firstDigitTimeout="5"><PlayAudio username="user" password="pass">https://test.com</PlayAudio></Gather></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testGatherNestedVerbs() {
+        $speakSentence1 = new BandwidthLib\Voice\Bxml\SpeakSentence("First Sentence");
+        $playAudio1 = new BandwidthLib\Voice\Bxml\PlayAudio("https://audio1.com");
+        $playAudio2 = new BandwidthLib\Voice\Bxml\PlayAudio("https://audio2.com");
+        $speakSentence2 = new BandwidthLib\Voice\Bxml\SpeakSentence("Second Sentence");
+
+        $gather = new BandwidthLib\Voice\Bxml\Gather();
+        $gather->gatherUrl("https://gather.url/nextBXML");
+        $gather->speakSentence($speakSentence1);
+        $gather->playAudio($playAudio1);
+        $gather->playAudio($playAudio2);
+        $gather->speakSentence($speakSentence2);
+
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($gather);
+
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Gather gatherUrl="https://gather.url/nextBXML"><SpeakSentence>First Sentence</SpeakSentence><PlayAudio>https://audio1.com</PlayAudio><PlayAudio>https://audio2.com</PlayAudio><SpeakSentence>Second Sentence</SpeakSentence></Gather></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testHangup() {
+        $hangup = new BandwidthLib\Voice\Bxml\Hangup();
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($hangup);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Hangup/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testRedirect() {
+        $redirect = new BandwidthLib\Voice\Bxml\Redirect();
+        $redirect->username("user");
+        $redirect->password("pass");
+        $redirect->redirectUrl("https://test.com");
+        $redirect->redirectMethod("GET");
+        $redirect->tag("tag");
+        $redirect->redirectFallbackUrl("https://test2.com");
+        $redirect->redirectFallbackMethod("POST");
+        $redirect->fallbackUsername("fuser");
+        $redirect->fallbackPassword("fpass");
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($redirect);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Redirect username="user" password="pass" tag="tag" redirectUrl="https://test.com" redirectMethod="GET" redirectFallbackUrl="https://test2.com" redirectFallbackMethod="POST" fallbackUsername="fuser" fallbackPassword="fpass"/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testPause() {
+        $pause = new BandwidthLib\Voice\Bxml\Pause();
+        $pause->duration("3");
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($pause);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Pause duration="3"/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testSendDtmf() {
+        $sendDtmf = new BandwidthLib\Voice\Bxml\SendDtmf("123");
+        $sendDtmf->toneDuration("65");
+        $sendDtmf->toneInterval(75);
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($sendDtmf);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><SendDtmf toneDuration="65" toneInterval="75">123</SendDtmf></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testSpeakSentence() {
+        $speakSentence = new BandwidthLib\Voice\Bxml\SpeakSentence("Test");
+        $speakSentence->voice("susan");
+        $speakSentence->locale("en_US");
+        $speakSentence->gender("female");
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($speakSentence);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><SpeakSentence locale="en_US" gender="female" voice="susan">Test</SpeakSentence></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testSpeakSentenceSSML() {
+        $speakSentence = new BandwidthLib\Voice\Bxml\SpeakSentence('Hello, you have reached the home of <lang xml:lang="es-MX">Antonio Mendoza</lang>.Please leave a message.');
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($speakSentence);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><SpeakSentence>Hello, you have reached the home of <lang xml:lang="es-MX">Antonio Mendoza</lang>.Please leave a message.</SpeakSentence></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testPlayAudio() {
+        $playAudio = new BandwidthLib\Voice\Bxml\PlayAudio("https://test.com");
+        $playAudio->username("user");
+        $playAudio->password("pass");
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($playAudio);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><PlayAudio username="user" password="pass">https://test.com</PlayAudio></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testTransfer() {
+        $number1 = new BandwidthLib\Voice\Bxml\PhoneNumber("+17777777777");
+        $number1->transferAnswerUrl("https://test.com");
+        $number1->transferAnswerMethod("GET");
+        $number1->username("user");
+        $number1->password("pass");
+        $number1->tag("tag");
+        $number2 = new BandwidthLib\Voice\Bxml\PhoneNumber("+17777777779");
+        $number2->transferAnswerUrl("https://test2.com");
+        $number2->transferAnswerMethod("GET");
+        $number2->username("user2");
+        $number2->password("pass2");
+        $number2->tag("tag2");
+        $number2->transferAnswerFallbackUrl("https://test3.com");
+        $number2->transferAnswerFallbackMethod("POST");
+        $number2->fallbackUsername("fuser");
+        $number2->fallbackPassword("fpass");
+        $transfer = new BandwidthLib\Voice\Bxml\Transfer();
+        $transfer->transferCallerId("+18999999999");
+        $transfer->transferCompleteUrl("https://test.com");
+        $transfer->transferCompleteMethod("GET");
+        $transfer->username("user");
+        $transfer->password("pass");
+        $transfer->tag("tag");
+        $transfer->callTimeout(3);
+        $transfer->diversionTreatment("none");
+        $transfer->diversionReason("away");
+        $transfer->phoneNumbers(array($number1, $number2));
+        $transfer->transferCompleteFallbackUrl("https://test3.com");
+        $transfer->transferCompleteFallbackMethod("POST");
+        $transfer->fallbackUsername("fusern");
+        $transfer->fallbackPassword("fpassw");
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($transfer);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Transfer username="user" password="pass" tag="tag" transferCompleteUrl="https://test.com" transferCompleteMethod="GET" transferCallerId="+18999999999" callTimeout="3" diversionTreatment="none" diversionReason="away" transferCompleteFallbackUrl="https://test3.com" transferCompleteFallbackMethod="POST" fallbackUsername="fusern" fallbackPassword="fpassw"><PhoneNumber username="user" password="pass" tag="tag" transferAnswerUrl="https://test.com" transferAnswerMethod="GET">+17777777777</PhoneNumber><PhoneNumber username="user2" password="pass2" tag="tag2" transferAnswerUrl="https://test2.com" transferAnswerMethod="GET" transferAnswerFallbackUrl="https://test3.com" transferAnswerFallbackMethod="POST" fallbackUsername="fuser" fallbackPassword="fpass">+17777777779</PhoneNumber></Transfer></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testPauseRecording() {
+        $pauseRecording = new BandwidthLib\Voice\Bxml\PauseRecording();
+
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($pauseRecording);
+
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><PauseRecording/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testResumeRecording() {
+        $resumeRecording = new BandwidthLib\Voice\Bxml\ResumeRecording();
+
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($resumeRecording);
+
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><ResumeRecording/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testStartRecording() {
+        $startRecording = new BandwidthLib\Voice\Bxml\StartRecording();
+        $startRecording->tag("tag");
+        $startRecording->recordingAvailableUrl("https://myapp.com/noBXML");
+        $startRecording->recordingAvailableMethod("POST");
+        $startRecording->username("user");
+        $startRecording->password("pass");
+        $startRecording->fileFormat("wav");
+        $startRecording->multiChannel(true);
+        $startRecording->transcribe(false);
+        $startRecording->transcriptionAvailableUrl("https://available.com");
+        $startRecording->transcriptionAvailableMethod("GET");
+
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($startRecording);
+
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><StartRecording tag="tag" recordingAvailableUrl="https://myapp.com/noBXML" recordingAvailableMethod="POST" username="user" password="pass" fileFormat="wav" multiChannel="true" transcribe="false" transcriptionAvailableUrl="https://available.com" transcriptionAvailableMethod="GET"/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testStopRecording() {
+        $stopRecording = new BandwidthLib\Voice\Bxml\StopRecording();
+
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($stopRecording);
+
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><StopRecording/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testRecord() {
+        $record = new BandwidthLib\Voice\Bxml\Record();
+        $record->recordCompleteUrl("https://myapp.com/nextBXML");
+        $record->maxDuration(10);
+        $record->recordCompleteFallbackUrl("https://test.com");
+        $record->recordCompleteFallbackMethod("GET");
+        $record->fallbackUsername("fuser");
+        $record->fallbackPassword("fpass");
+
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($record);
+
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Record recordCompleteUrl="https://myapp.com/nextBXML" maxDuration="10" recordCompleteFallbackUrl="https://test.com" recordCompleteFallbackMethod="GET" fallbackUsername="fuser" fallbackPassword="fpass"/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testConference() {
+        $conference = new BandwidthLib\Voice\Bxml\Conference("conference-name");
+        $conference->mute(true);
+        $conference->hold(false);
+        $conference->callIdsToCoach("c-abc,c-def");
+        $conference->conferenceEventUrl("https://test.com");
+        $conference->conferenceEventMethod("GET");
+        $conference->username("user");
+        $conference->password("pass");
+        $conference->tag("tag");
+        $conference->conferenceEventFallbackUrl("https://test2.com");
+        $conference->conferenceEventFallbackMethod("POST");
+        $conference->fallbackUsername("fuser");
+        $conference->fallbackPassword("fpass");
+
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($conference);
+
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Conference username="user" password="pass" tag="tag" mute="true" hold="false" callIdsToCoach="c-abc,c-def" conferenceEventUrl="https://test.com" conferenceEventMethod="GET" conferenceEventFallbackUrl="https://test2.com" conferenceEventFallbackMethod="POST" fallbackUsername="fuser" fallbackPassword="fpass">conference-name</Conference></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testConferenceCallIdsToCoachArray() {
+        $conference = new BandwidthLib\Voice\Bxml\Conference("conference-name");
+        $conference->callIdsToCoachArray(["c-abc", "c-def"]);
+
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($conference);
+
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Conference callIdsToCoach="c-abc,c-def">conference-name</Conference></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testBridge() {
+        $bridge = new BandwidthLib\Voice\Bxml\Bridge("c-95ac8d6e-1a31c52e-b38f-4198-93c1-51633ec68f8d");
+        $bridge->bridgeCompleteUrl("https://test.com");
+        $bridge->bridgeCompleteMethod("GET");
+        $bridge->bridgeTargetCompleteUrl("https://test2.com");
+        $bridge->bridgeTargetCompleteMethod("POST");
+        $bridge->username("user");
+        $bridge->password("pass");
+        $bridge->tag("custom tag");
+        $bridge->bridgeCompleteFallbackUrl("https://test3.com");
+        $bridge->bridgeCompleteFallbackMethod("GET");
+        $bridge->bridgeTargetCompleteFallbackUrl("https://test4.com");
+        $bridge->bridgeTargetCompleteFallbackMethod("POST");
+        $bridge->fallbackUsername("fuser");
+        $bridge->fallbackPassword("fpass");
+
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($bridge);
+
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Bridge bridgeCompleteUrl="https://test.com" bridgeCompleteMethod="GET" bridgeTargetCompleteUrl="https://test2.com" bridgeTargetCompleteMethod="POST" username="user" password="pass" tag="custom tag" bridgeCompleteFallbackUrl="https://test3.com" bridgeCompleteFallbackMethod="GET" bridgeTargetCompleteFallbackUrl="https://test4.com" bridgeTargetCompleteFallbackMethod="POST" fallbackUsername="fuser" fallbackPassword="fpass">c-95ac8d6e-1a31c52e-b38f-4198-93c1-51633ec68f8d</Bridge></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testRing() {
+        $ring = new BandwidthLib\Voice\Bxml\Ring();
+        $ring->duration(5);
+
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($ring);
+
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><Ring duration="5"/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testStartGather() {
+        $startGather = new BandwidthLib\Voice\Bxml\StartGather();
+        $startGather->username("user");
+        $startGather->password("pass");
+        $startGather->dtmfUrl("https://test.com");
+        $startGather->dtmfMethod("GET");
+        $startGather->tag("custom tag");
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($startGather);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><StartGather username="user" password="pass" tag="custom tag" dtmfUrl="https://test.com" dtmfMethod="GET"/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+
+    public function testStopGather() {
+        $stopGather = new BandwidthLib\Voice\Bxml\StopGather();
+        $response = new BandwidthLib\Voice\Bxml\Response();
+        $response->addVerb($stopGather);
+        $expectedXml = '<?xml version="1.0" encoding="UTF-8"?><Response><StopGather/></Response>';
+        $responseXml = $response->toBxml();
+        $this->assertEquals($expectedXml, $responseXml);
+    }
+}