diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 87baf1b..a390582 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        php-versions: ['7.4', '8.0', '8.1', '8.2', '8.3']
+        php-versions: ['8.1', '8.2', '8.3']
 
     steps:
     - uses: actions/checkout@v2
diff --git a/.gitignore b/.gitignore
index bf4e8d7..a746b1b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /vendor/
-/.phpunit.result.cache
-/composer.lock
\ No newline at end of file
+/.phpunit.cache
+/composer.lock
+/.phpunit.result.cache
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7d589a8..1beaf34 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,12 @@
 # CHANGELOG
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+### Changed
+- Support for PHP 7.4 and 8.0 has been dropped. Please use v2.0.0 if you need to use this with an older version of PHP.
 
 ## v2.0.0
 There are **no breaking changes** to the library, but the minimum PHP version is now 7.4.
diff --git a/composer.json b/composer.json
index 2957977..eb27932 100644
--- a/composer.json
+++ b/composer.json
@@ -14,11 +14,11 @@
         }
     ],
     "require": {
-        "php": ">=7.4",
+        "php": ">=8.0",
         "guzzlehttp/guzzle": "^7.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9",
+        "phpunit/phpunit": "^10.0",
         "phpstan/phpstan": "^0.12",
         "php-coveralls/php-coveralls": "^2.4"
     },
diff --git a/phpunit.xml b/phpunit.xml
index 0efe8a0..d8f6cb6 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,13 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" backupGlobals="false" backupStaticAttributes="false" bootstrap="vendor/autoload.php" colors="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" processIsolation="false" stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
-  <coverage includeUncoveredFiles="true">
-    <include>
-      <directory suffix=".php">./src</directory>
-    </include>
-  </coverage>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" backupGlobals="false" bootstrap="vendor/autoload.php" colors="true" processIsolation="false" stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd" cacheDirectory=".phpunit.cache" backupStaticProperties="false">
   <testsuites>
     <testsuite name="Test Suite">
-      <directory suffix=".php">./tests</directory>
+      <directory suffix=".php">./tests/Unit</directory>
     </testsuite>
   </testsuites>
+  <source>
+    <include>
+      <directory suffix=".php">./src</directory>
+    </include>
+  </source>
 </phpunit>
diff --git a/tests/TestCase.php b/tests/SdkBaseTestCase.php
similarity index 93%
rename from tests/TestCase.php
rename to tests/SdkBaseTestCase.php
index 329f446..c60a35a 100644
--- a/tests/TestCase.php
+++ b/tests/SdkBaseTestCase.php
@@ -10,12 +10,12 @@
 use GuzzleHttp\Exception\RequestException;
 use PHPUnit\Framework\TestCase as BaseTestCase;
 
-abstract class TestCase extends BaseTestCase
+abstract class SdkBaseTestCase extends BaseTestCase
 {
     protected $api;
     protected $test_class;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Unit/DeadLetterQueue.php b/tests/Unit/DeadLetterQueue.php
index e1e0e1a..99b7a0e 100644
--- a/tests/Unit/DeadLetterQueue.php
+++ b/tests/Unit/DeadLetterQueue.php
@@ -2,13 +2,13 @@
 
 namespace Northwestern\SysDev\SOA\EventHub\Tests\Unit;
 
-use Northwestern\SysDev\SOA\EventHub\Tests\TestCase;
+use Northwestern\SysDev\SOA\EventHub\Tests\SdkBaseTestCase;
 
-class DeadLetterQueue extends TestCase
+final class DeadLetterQueue extends SdkBaseTestCase
 {
     protected $test_class = \Northwestern\SysDev\SOA\EventHub\DeadLetterQueue::class;
 
-    public function test_get_info()
+    public function test_get_info(): void
     {
         $response = '{"name":"etsysdev.test.queue.name.DLQ","realName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name.DLQ","eventHubAccount":"sysdev-test-acct","destinationType":"DLQ","queueStatistics":[{"label":"QueueSize","maximum":null,"minimum":null,"startTime":null,"sum":null,"current":null,"sampleSize":null,"average":null},{"label":"EnqueueCount","maximum":null,"minimum":null,"startTime":null,"sum":null,"current":null,"sampleSize":null,"average":null},{"label":"EnqueueTime","maximum":null,"minimum":null,"startTime":null,"sum":null,"current":null,"sampleSize":null,"average":null},{"label":"ExpiredCount","maximum":null,"minimum":null,"startTime":null,"sum":null,"current":null,"sampleSize":null,"average":null},{"label":"DispatchCount","maximum":null,"minimum":null,"startTime":null,"sum":null,"current":null,"sampleSize":null,"average":null},{"label":"DequeueCount","maximum":null,"minimum":null,"startTime":null,"sum":null,"current":null,"sampleSize":null,"average":null}]}';
 
@@ -23,7 +23,7 @@ public function test_get_info()
         $this->assertEquals('etsysdev.test.queue.name.DLQ', $dlq['name']);
     } // end test_get_info
 
-    public function test_move_to_dlq()
+    public function test_move_to_dlq(): void
     {
         $this->api->setHttpClient($this->mockHttpResponse(204, null));
 
@@ -31,7 +31,7 @@ public function test_move_to_dlq()
         $this->assertTrue($status);
     } // end test_move_to_dlq
 
-    public function test_read_oldest()
+    public function test_read_oldest(): void
     {
         $response_id = 'ID:12345:baz';
         $response_body = ['cool' => 'message'];
@@ -54,7 +54,7 @@ public function test_read_oldest()
         $this->assertNull($message);
     } // end test_read_oldest
 
-    public function test_move_from_dlq()
+    public function test_move_from_dlq(): void
     {
         $this->api->setHttpClient($this->mockHttpResponse(204, null));
 
diff --git a/tests/Unit/DeliveredMessage.php b/tests/Unit/DeliveredMessage.php
index 0e8743b..195e790 100644
--- a/tests/Unit/DeliveredMessage.php
+++ b/tests/Unit/DeliveredMessage.php
@@ -2,19 +2,19 @@
 
 namespace Northwestern\SysDev\SOA\EventHub\Tests\Unit;
 
-use Northwestern\SysDev\SOA\EventHub\Tests\TestCase;
+use Northwestern\SysDev\SOA\EventHub\Tests\SdkBaseTestCase;
 use Northwestern\SysDev\SOA\EventHub\Model\DeliveredMessage as DeliveredMessageModel; // same name as the class, needs an alias to work
 
-class DeliveredMessage extends TestCase
+final class DeliveredMessage extends SdkBaseTestCase
 {
-    public function test_opens_json_message()
+    public function test_opens_json_message(): void
     {
         $msg = new DeliveredMessageModel('ID:12345', '{"test": true}');
 
         $this->assertArrayHasKey('test', $msg->getMessage());
     } // end test_opens_json_message
 
-    public function test_raw_xml_available()
+    public function test_raw_xml_available(): void
     {
         $xml = '<?xml version="1.0" encoding="UTF-8"?><note><to>Tove</to><from>Jani</from><heading>Reminder</heading><body>Do the thing this weekend!</body></note>';
         $msg = new DeliveredMessageModel('ID:12345', $xml);
@@ -23,7 +23,7 @@ public function test_raw_xml_available()
         $this->assertEquals($xml, $msg->getRawMessage());
     } // end test_raw_xml_available
 
-    public function test_has_message_id()
+    public function test_has_message_id(): void
     {
         $id = 'ID:12345';
         $msg = new DeliveredMessageModel($id, '');
diff --git a/tests/Unit/ErrorHandling.php b/tests/Unit/ErrorHandling.php
index 8dafd9e..fb98c85 100644
--- a/tests/Unit/ErrorHandling.php
+++ b/tests/Unit/ErrorHandling.php
@@ -2,14 +2,14 @@
 
 namespace Northwestern\SysDev\SOA\EventHub\Tests\Unit;
 
-use Northwestern\SysDev\SOA\EventHub\Tests\TestCase;
+use Northwestern\SysDev\SOA\EventHub\Tests\SdkBaseTestCase;
 
-class ErrorHandling extends TestCase
+final class ErrorHandling extends SdkBaseTestCase
 {
     // Doesn't matter, they all use EventHubBase, which is what we're testing.
     protected $test_class = \Northwestern\SysDev\SOA\EventHub\Topic::class;
 
-    public function test_connection_problem()
+    public function test_connection_problem(): void
     {
         $this->expectException(\Northwestern\SysDev\SOA\EventHub\Exception\EventHubDown::class);
 
@@ -18,7 +18,7 @@ public function test_connection_problem()
         $this->api->listAll();
     } // end test_connection_problem
 
-    public function test_unauthorized_access()
+    public function test_unauthorized_access(): void
     {
         $this->expectException(\Northwestern\SysDev\SOA\EventHub\Exception\EventHubError::class);
         $this->expectExceptionCode(500);
diff --git a/tests/Unit/Message.php b/tests/Unit/Message.php
index e43a16e..01869a5 100644
--- a/tests/Unit/Message.php
+++ b/tests/Unit/Message.php
@@ -2,13 +2,13 @@
 
 namespace Northwestern\SysDev\SOA\EventHub\Tests\Unit;
 
-use Northwestern\SysDev\SOA\EventHub\Tests\TestCase;
+use Northwestern\SysDev\SOA\EventHub\Tests\SdkBaseTestCase;
 
-class Message extends TestCase
+final class Message extends SdkBaseTestCase
 {
     protected $test_class = \Northwestern\SysDev\SOA\EventHub\Message::class;
 
-    public function test_read_oldest()
+    public function test_read_oldest(): void
     {
         $response_id = 'ID:12345:baz';
         $response_body = ['cool' => 'message'];
@@ -31,20 +31,20 @@ public function test_read_oldest()
         $this->assertNull($message);
     } // end test_read_oldest
 
-    public function test_acknowledge_oldest()
+    public function test_acknowledge_oldest(): void
     {
         $this->api->setHttpClient($this->mockHttpResponse(204, null));
         $status = $this->api->acknowledgeOldest('etsysdev.test.queue.name');
         $this->assertTrue($status);
     } // end test_acknowledge_oldest
 
-    public function test_read()
+    public function test_read(): void
     {
         // Does not currently work in EventHub
         $this->markTestIncomplete();
     } // end test_read
 
-    public function test_acknowledge()
+    public function test_acknowledge(): void
     {
         // With fastForward arg
         $this->api->setHttpClient($this->mockHttpResponse(204, null));
@@ -57,7 +57,7 @@ public function test_acknowledge()
         $this->assertTrue($status);
     } // end test_acknowledge
 
-    public function test_move()
+    public function test_move(): void
     {
         // With delay arg
         $this->api->setHttpClient($this->mockHttpResponse(204, null));
diff --git a/tests/Unit/Queue.php b/tests/Unit/Queue.php
index 93a9666..6c855e1 100644
--- a/tests/Unit/Queue.php
+++ b/tests/Unit/Queue.php
@@ -2,13 +2,13 @@
 
 namespace Northwestern\SysDev\SOA\EventHub\Tests\Unit;
 
-use Northwestern\SysDev\SOA\EventHub\Tests\TestCase;
+use Northwestern\SysDev\SOA\EventHub\Tests\SdkBaseTestCase;
 
-class Queue extends TestCase
+final class Queue extends SdkBaseTestCase
 {
     protected $test_class = \Northwestern\SysDev\SOA\EventHub\Queue::class;
 
-    public function test_list_all()
+    public function test_list_all(): void
     {
         $response = '[{"eventHubAccount":"sysdev-test-acct","topicName":"etsysdev.test.queue.name","readTimeout":1000,"autoAcknowledge":false,"queueRealName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","alertAddress":"nicholas.evans@northwestern.edu","queueStatistics":[{"label":"QueueSize","maximum":0,"minimum":0,"startTime":"2018-10-31T06:39:00","sum":null,"average":0,"current":0,"sampleSize":null},{"label":"EnqueueCount","maximum":null,"minimum":null,"startTime":"2018-10-31T06:39:00","sum":0,"average":null,"current":null,"sampleSize":null},{"label":"EnqueueTime","maximum":2076194,"minimum":5738,"startTime":"2018-10-31T06:39:00","sum":null,"average":791356.4578313242,"current":null,"sampleSize":null},{"label":"ExpiredCount","maximum":null,"minimum":null,"startTime":"2018-10-31T06:39:00","sum":0,"average":null,"current":null,"sampleSize":null},{"label":"DispatchCount","maximum":null,"minimum":null,"startTime":"2018-10-31T06:39:00","sum":0,"average":null,"current":null,"sampleSize":null},{"label":"DequeueCount","maximum":null,"minimum":null,"startTime":"2018-10-31T06:39:00","sum":0,"average":null,"current":null,"sampleSize":null}],"selfPublishingAllowed":true,"destinationType":"QUEUE","name":"etsysdev.test.queue.name","realName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","hasMessage":false,"dlqName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name.DLQ"}]';
 
@@ -23,7 +23,7 @@ public function test_list_all()
         $this->assertEquals('etsysdev.test.queue.name', $queues[0]['topicName']);
     } // end test_list_all
 
-    public function test_get_info()
+    public function test_get_info(): void
     {
         $response = '{"eventHubAccount":"sysdev-test-acct","topicName":"etsysdev.test.queue.name","readTimeout":1000,"autoAcknowledge":false,"queueRealName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","alertAddress":"nicholas.evans@northwestern.edu","queueStatistics":[{"label":"QueueSize","maximum":0,"minimum":0,"startTime":"2018-10-31T06:39:00","sum":null,"average":0,"current":0,"sampleSize":null},{"label":"EnqueueCount","maximum":null,"minimum":null,"startTime":"2018-10-31T06:39:00","sum":0,"average":null,"current":null,"sampleSize":null},{"label":"EnqueueTime","maximum":2076194,"minimum":5738,"startTime":"2018-10-31T06:39:00","sum":null,"average":791356.4578313242,"current":null,"sampleSize":null},{"label":"ExpiredCount","maximum":null,"minimum":null,"startTime":"2018-10-31T06:39:00","sum":0,"average":null,"current":null,"sampleSize":null},{"label":"DispatchCount","maximum":null,"minimum":null,"startTime":"2018-10-31T06:39:00","sum":0,"average":null,"current":null,"sampleSize":null},{"label":"DequeueCount","maximum":null,"minimum":null,"startTime":"2018-10-31T06:39:00","sum":0,"average":null,"current":null,"sampleSize":null}],"selfPublishingAllowed":true,"destinationType":"QUEUE","name":"etsysdev.test.queue.name","realName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","hasMessage":false,"dlqName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name.DLQ"}';
 
@@ -38,7 +38,7 @@ public function test_get_info()
         $this->assertEquals('etsysdev.test.queue.name', $queue['topicName']);
     } // end test_get_info
 
-    public function test_clear_all_messages()
+    public function test_clear_all_messages(): void
     {
         $this->api->setHttpClient($this->mockHttpResponse(204, ''));
         $status = $this->api->clearAllMessages('etsysdev.test.queue.name');
@@ -46,7 +46,7 @@ public function test_clear_all_messages()
         $this->assertTrue($status);
     } // end test_clear_all_messages
 
-    public function test_configure()
+    public function test_configure(): void
     {
         $response = '{"eventHubAccount":"sysdev-test-acct","topicName":"etsysdev.test.queue.name","readTimeout":1000,"autoAcknowledge":false,"queueRealName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","alertAddress":"nicholas.evans@northwestern.edu","queueStatistics":[],"selfPublishingAllowed":true,"destinationType":"QUEUE","name":"etsysdev.test.queue.name","realName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","hasMessage":false,"dlqName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name.DLQ"}';
 
@@ -55,7 +55,7 @@ public function test_configure()
         $this->assertEquals('etsysdev.test.queue.name', $queue['topicName']);
     } // end test_configure
 
-    public function test_send_test_json_message()
+    public function test_send_test_json_message(): void
     {
         $response_id = 'ID:12345:baz';
         $this->api->setHttpClient($this->mockHttpResponse(204, null, ['X-message-id' => $response_id]));
@@ -64,7 +64,7 @@ public function test_send_test_json_message()
         $this->assertEquals($response_id, $message_id);
     } // end test_send_test_json_message
 
-    public function test_send_test_message()
+    public function test_send_test_message(): void
     {
         $response_id = 'ID:12345:baz';
         $this->api->setHttpClient($this->mockHttpResponse(204, null, ['X-message-id' => $response_id]));
diff --git a/tests/Unit/Topic.php b/tests/Unit/Topic.php
index 249bdee..8523525 100644
--- a/tests/Unit/Topic.php
+++ b/tests/Unit/Topic.php
@@ -2,13 +2,13 @@
 
 namespace Northwestern\SysDev\SOA\EventHub\Tests\Unit;
 
-use Northwestern\SysDev\SOA\EventHub\Tests\TestCase;
+use Northwestern\SysDev\SOA\EventHub\Tests\SdkBaseTestCase;
 
-class Topic extends TestCase
+final class Topic extends SdkBaseTestCase
 {
     protected $test_class = \Northwestern\SysDev\SOA\EventHub\Topic::class;
 
-    public function test_list_all()
+    public function test_list_all(): void
     {
         $response = '[{"eventHubAccount":"sysdev-test-acct","topicName":"etsysdev.test.queue.name","readTimeout":1000,"autoAcknowledge":false,"queueRealName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","alertAddress":"nicholas.evans@northwestern.edu","queueStatistics":[{"label":"QueueSize","maximum":1,"minimum":0,"startTime":"2018-10-30T14:18:00","sum":null,"current":0,"sampleSize":null,"average":0.5},{"label":"EnqueueCount","maximum":null,"minimum":null,"startTime":"2018-10-30T14:18:00","sum":1,"current":null,"sampleSize":null,"average":null},{"label":"EnqueueTime","maximum":2076194,"minimum":5738,"startTime":"2018-10-30T14:18:00","sum":null,"current":null,"sampleSize":null,"average":784116.5967366379},{"label":"ExpiredCount","maximum":null,"minimum":null,"startTime":"2018-10-30T14:18:00","sum":1,"current":null,"sampleSize":null,"average":null},{"label":"DispatchCount","maximum":null,"minimum":null,"startTime":"2018-10-30T14:18:00","sum":9,"current":null,"sampleSize":null,"average":null},{"label":"DequeueCount","maximum":null,"minimum":null,"startTime":"2018-10-30T14:18:00","sum":1,"current":null,"sampleSize":null,"average":null}],"selfPublishingAllowed":true,"destinationType":"QUEUE","name":"etsysdev.test.queue.name","realName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","hasMessage":false,"dlqName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name.DLQ"}]';
 
@@ -23,7 +23,7 @@ public function test_list_all()
         $this->assertEquals('etsysdev.test.queue.name', $queues[0]['topicName']);
     } // end test_list_all
 
-    public function test_get_info()
+    public function test_get_info(): void
     {
         $response = '{"eventHubAccount":"sysdev-test-acct","topicName":"etsysdev.test.queue.name","readTimeout":1000,"autoAcknowledge":false,"queueRealName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","alertAddress":"nicholas.evans@northwestern.edu","queueStatistics":[{"label":"QueueSize","startTime":"2018-10-30T14:22:00","maximum":1,"minimum":0,"current":0,"sum":null,"average":0.5,"sampleSize":null},{"label":"EnqueueCount","startTime":"2018-10-30T14:22:00","maximum":null,"minimum":null,"current":null,"sum":1,"average":null,"sampleSize":null},{"label":"EnqueueTime","startTime":"2018-10-30T14:22:00","maximum":2076194,"minimum":5738,"current":null,"sum":null,"average":785780.1386910215,"sampleSize":null},{"label":"ExpiredCount","startTime":"2018-10-30T14:22:00","maximum":null,"minimum":null,"current":null,"sum":1,"average":null,"sampleSize":null},{"label":"DispatchCount","startTime":"2018-10-30T14:22:00","maximum":null,"minimum":null,"current":null,"sum":9,"average":null,"sampleSize":null},{"label":"DequeueCount","startTime":"2018-10-30T14:22:00","maximum":null,"minimum":null,"current":null,"sum":1,"average":null,"sampleSize":null}],"selfPublishingAllowed":true,"destinationType":"QUEUE","name":"etsysdev.test.queue.name","realName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","hasMessage":false,"dlqName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name.DLQ"}';
 
@@ -38,7 +38,7 @@ public function test_get_info()
         $this->assertEquals('etsysdev.test.queue.name', $queue['topicName']);
     } // end test_get_info
 
-    public function test_configure()
+    public function test_configure(): void
     {
         $response = '{"eventHubAccount":"sysdev-test-acct","topicName":"etsysdev.test.queue.name","readTimeout":1000,"autoAcknowledge":false,"queueRealName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","alertAddress":"nicholas.evans@northwestern.edu","queueStatistics":[],"selfPublishingAllowed":true,"destinationType":"QUEUE","name":"etsysdev.test.queue.name","realName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name","hasMessage":false,"dlqName":"Consumer.sysdev-test-acct.VirtualTopic.etsysdev.test.queue.name.DLQ"}';
         $this->api->setHttpClient($this->mockHttpResponse(200, $response));
@@ -47,7 +47,7 @@ public function test_configure()
         $this->assertEquals('etsysdev.test.queue.name', $config['topicName']);
     } // end test_configure
 
-    public function test_write_json_message()
+    public function test_write_json_message(): void
     {
         $response_id = 'ID:12345:baz';
         $this->api->setHttpClient($this->mockHttpResponse(204, null, ['X-message-id' => $response_id]));
@@ -56,7 +56,7 @@ public function test_write_json_message()
         $this->assertEquals($response_id, $message_id);
     } // end test_write_json_message
 
-    public function test_write_message()
+    public function test_write_message(): void
     {
         $response_id = 'ID:12345:baz';
         $this->api->setHttpClient($this->mockHttpResponse(204, null, ['X-message-id' => $response_id]));
diff --git a/tests/Unit/Webhook.php b/tests/Unit/Webhook.php
index af1312e..e93faca 100644
--- a/tests/Unit/Webhook.php
+++ b/tests/Unit/Webhook.php
@@ -2,13 +2,13 @@
 
 namespace Northwestern\SysDev\SOA\EventHub\Tests\Unit;
 
-use Northwestern\SysDev\SOA\EventHub\Tests\TestCase;
+use Northwestern\SysDev\SOA\EventHub\Tests\SdkBaseTestCase;
 
-class Webhook extends TestCase
+final class Webhook extends SdkBaseTestCase
 {
     protected $test_class = \Northwestern\SysDev\SOA\EventHub\Webhook::class;
 
-    public function test_list_all()
+    public function test_list_all(): void
     {
         $response = '{"eventHubAccount":"sysdev-test-acct","webhooks":[{"topicName":"etsysdev.test.queue.name","callbackURL":"\/v1\/event-hub\/webhook\/etsysdev.test.queue.name"}]}';
         $this->api->setHttpClient($this->mockHttpResponse(200, $response));
@@ -17,7 +17,7 @@ public function test_list_all()
         $this->assertArrayHasKey('webhooks', $hooks);
     } // end test_list_all
 
-    public function test_get_info()
+    public function test_get_info(): void
     {
         $response = '{"topicName":"etsysdev.test.queue.name","endpoint":"http:\/\/localhost:9080\/GenericMQ\/test\/apikey","securityTypes":["NONE"],"contentType":"application\/json","active":false,"webhookSecurity":[],"webhookStatistics":[],"event_hub_account":"sysdev-test-acct"}';
         $this->api->setHttpClient($this->mockHttpResponse(200, $response));
@@ -26,7 +26,7 @@ public function test_get_info()
         $this->assertEquals('etsysdev.test.queue.name', $hook['topicName']);
     } // end test_get_info
 
-    public function test_delete()
+    public function test_delete(): void
     {
         $this->api->setHttpClient($this->mockHttpResponse(204, ''));
 
@@ -34,7 +34,7 @@ public function test_delete()
         $this->assertTrue($status);
     } // end test_delete
 
-    public function test_create()
+    public function test_create(): void
     {
         $this->api->setHttpClient($this->mockHttpResponse(204, ''));
 
@@ -42,7 +42,7 @@ public function test_create()
         $this->assertTrue($status);
     } // end test_create
 
-    public function test_update_config()
+    public function test_update_config(): void
     {
         $response = '{"topicName":"etsysdev.test.queue.name","endpoint":"http:\/\/localhost:9080\/GenericMQ\/test\/apikey","securityTypes":["NONE"],"contentType":"application\/json","active":true,"webhookSecurity":[],"webhookStatistics":null,"event_hub_account":"sysdev-test-acct"}';
         $this->api->setHttpClient($this->mockHttpResponse(200, $response));
@@ -51,7 +51,7 @@ public function test_update_config()
         $this->assertEquals('etsysdev.test.queue.name', $hook['topicName']);
     } // end test_update_config
 
-    public function test_pause()
+    public function test_pause(): void
     {
         $response = '{"topicName":"etsysdev.test.queue.name","endpoint":"http:\/\/localhost:9080\/GenericMQ\/test\/apikey","securityTypes":["NONE"],"contentType":"application\/json","active":false,"webhookSecurity":[],"webhookStatistics":null,"event_hub_account":"sysdev-test-acct"}';
         $this->api->setHttpClient($this->mockHttpResponse(200, $response));
@@ -60,7 +60,7 @@ public function test_pause()
         $this->assertEquals('etsysdev.test.queue.name', $hook['topicName']);
     } // end test_pause
 
-    public function test_unpause()
+    public function test_unpause(): void
     {
         $response = '{"topicName":"etsysdev.test.queue.name","endpoint":"http:\/\/localhost:9080\/GenericMQ\/test\/apikey","securityTypes":["NONE"],"contentType":"application\/json","active":true,"webhookSecurity":[],"webhookStatistics":null,"event_hub_account":"sysdev-test-acct"}';
         $this->api->setHttpClient($this->mockHttpResponse(200, $response));