diff --git a/src/Tests/CaptchaAdminTestCase.php b/src/Tests/CaptchaAdminTestCase.php
index bc5139f..7342275 100644
--- a/src/Tests/CaptchaAdminTestCase.php
+++ b/src/Tests/CaptchaAdminTestCase.php
@@ -12,6 +12,11 @@ namespace Drupal\captcha\Tests;
 use Drupal\captcha\Entity\CaptchaPoint;
 use stdClass;
 
+/**
+ * Tests CAPTCHA admin settings.
+ *
+ * @group captcha
+ */
 class CaptchaAdminTestCase extends CaptchaBaseWebTestCase {
 
   /**
diff --git a/src/Tests/CaptchaPersistenceTestCase.php b/src/Tests/CaptchaPersistenceTestCase.php
index 4596236..8f13347 100644
--- a/src/Tests/CaptchaPersistenceTestCase.php
+++ b/src/Tests/CaptchaPersistenceTestCase.php
@@ -11,6 +11,11 @@
 
 namespace Drupal\captcha\Tests;
 
+/**
+ * Tests CAPTCHA Persistence.
+ *
+ * @group captcha
+ */
 class CaptchaPersistenceTestCase extends CaptchaBaseWebTestCase {
   /**
    * {@inheritdoc}
diff --git a/src/Tests/CaptchaSessionReuseAttackTestCase.php b/src/Tests/CaptchaSessionReuseAttackTestCase.php
index 59e13ae..57dc24b 100644
--- a/src/Tests/CaptchaSessionReuseAttackTestCase.php
+++ b/src/Tests/CaptchaSessionReuseAttackTestCase.php
@@ -11,6 +11,11 @@
 
 namespace Drupal\captcha\Tests;
 
+/**
+ * Tests CAPTCHA session reusing.
+ *
+ * @group captcha
+ */
 class CaptchaSessionReuseAttackTestCase extends CaptchaBaseWebTestCase {
 
   /**
diff --git a/src/Tests/CaptchaTestCase.php b/src/Tests/CaptchaTestCase.php
index f2b836f..b5d390f 100644
--- a/src/Tests/CaptchaTestCase.php
+++ b/src/Tests/CaptchaTestCase.php
@@ -7,6 +7,11 @@
 
 namespace Drupal\captcha\Tests;
 
+/**
+ * Tests CAPTCHA main test case.
+ *
+ * @group captcha
+ */
 class CaptchaTestCase extends CaptchaBaseWebTestCase {
 
   /**