diff --git a/tests/behatstep_test.php b/tests/behatstep_test.php
index e1ae307..dca8eb5 100644
--- a/tests/behatstep_test.php
+++ b/tests/behatstep_test.php
@@ -30,7 +30,7 @@
  * @copyright  2017 Renaat Debleu (www.eWallah.net) (based on work by Dongsheng Cai)
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class behatstep_test extends \advanced_testcase {
+final class behatstep_test extends \advanced_testcase {
 
     /**
      * Basic test of step.
diff --git a/tests/delete_test.php b/tests/delete_test.php
index e8cfaf7..8062645 100644
--- a/tests/delete_test.php
+++ b/tests/delete_test.php
@@ -31,7 +31,7 @@
  * @copyright  2017 Renaat Debleu (www.eWallah.net) (based on work by Dongsheng Cai)
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class delete_test extends \advanced_testcase {
+final class delete_test extends \advanced_testcase {
 
     /**
      * Test deleting a s3 bucket.
diff --git a/tests/form_test.php b/tests/form_test.php
index 86d9e82..2e003e3 100644
--- a/tests/form_test.php
+++ b/tests/form_test.php
@@ -39,7 +39,7 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  * @coversDefaultClass \repository_s3bucket
  */
-class form_test extends \advanced_testcase {
+final class form_test extends \advanced_testcase {
 
     /** @var int repo */
     protected $repo;
diff --git a/tests/generator_test.php b/tests/generator_test.php
index 1a9455a..502f884 100644
--- a/tests/generator_test.php
+++ b/tests/generator_test.php
@@ -30,7 +30,7 @@
  * @copyright  2017 Renaat Debleu (www.eWallah.net) (based on work by Dongsheng Cai)
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class generator_test extends \advanced_testcase {
+final class generator_test extends \advanced_testcase {
 
     /**
      * Create type and instance.
diff --git a/tests/mock_test.php b/tests/mock_test.php
index 94f9dd2..d9c8b01 100644
--- a/tests/mock_test.php
+++ b/tests/mock_test.php
@@ -40,7 +40,7 @@
  * @copyright  2017 Renaat Debleu (www.eWallah.net) (based on work by Dongsheng Cai)
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class mock_test extends \advanced_testcase {
+final class mock_test extends \advanced_testcase {
 
     /**
      * Create type and instance.
diff --git a/tests/other_test.php b/tests/other_test.php
index dc1a3d2..f1b6cb5 100644
--- a/tests/other_test.php
+++ b/tests/other_test.php
@@ -37,7 +37,7 @@
  * @copyright  2017 Renaat Debleu (www.eWallah.net) (based on work by Dongsheng Cai)
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class other_test extends \advanced_testcase {
+final class other_test extends \advanced_testcase {
 
     /** @var int repo */
     protected $repo;
diff --git a/tests/privacy/privacy_test.php b/tests/privacy/privacy_test.php
index 92eace6..dfef88f 100644
--- a/tests/privacy/privacy_test.php
+++ b/tests/privacy/privacy_test.php
@@ -33,7 +33,7 @@
  * @copyright  2017 Renaat Debleu (www.eWallah.net) (based on work by Dongsheng Cai)
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class privacy_test extends provider_testcase {
+final class privacy_test extends provider_testcase {
 
     /**
      * Test privacy.