diff --git a/src/Tests/SmsFrameworkWebTest.php b/src/Tests/SmsFrameworkWebTest.php
index 5467c75..6683724 100644
--- a/src/Tests/SmsFrameworkWebTest.php
+++ b/src/Tests/SmsFrameworkWebTest.php
@@ -13,7 +13,7 @@ namespace Drupal\sms\Tests;
  * @group SMS Framework
  */
 class SmsFrameworkWebTest extends SmsFrameworkWebTestBase {
-  
+
   /**
    * Tests the HookGateway implementation.
    */
diff --git a/src/Tests/SmsFrameworkWebTestBase.php b/src/Tests/SmsFrameworkWebTestBase.php
index fafc8a8..b4aabec 100644
--- a/src/Tests/SmsFrameworkWebTestBase.php
+++ b/src/Tests/SmsFrameworkWebTestBase.php
@@ -12,7 +12,7 @@ use \Drupal\simpletest\WebTestBase;
 /**
  * Provides commonly used functionality for tests.
  */
-class SmsFrameworkWebTestBase extends WebTestBase {
+abstract class SmsFrameworkWebTestBase extends WebTestBase {
 
   public static $modules = ['sms', 'sms_test_gateway'];
 
@@ -23,6 +23,9 @@ class SmsFrameworkWebTestBase extends WebTestBase {
    */
   protected $gatewayManager;
 
+  /**
+   * {@inheritdoc}
+   */
   public function setUp() {
     parent::setUp();
     $this->gatewayManager = $this->container->get('plugin.manager.sms_gateway');
@@ -30,6 +33,12 @@ class SmsFrameworkWebTestBase extends WebTestBase {
     $this->gatewayManager->addGateway('test', ['name' => 'test']);
   }
 
+  /**
+   * Sets the specified gateway as the default.
+   *
+   * @param string $gateway_id
+   *   The ID of the gateway to be set as default.
+   */
   public function setDefaultGateway($gateway_id) {
     // Ensure gateway is enabled first.
     $this->gatewayManager->setEnabledGateways([$gateway_id]);