diff --git a/tests/src/Functional/APIRequestTest.php b/tests/src/Functional/APIRequestTest.php
index 38737c5..8615b41 100644
--- a/tests/src/Functional/APIRequestTest.php
+++ b/tests/src/Functional/APIRequestTest.php
@@ -22,7 +22,7 @@ class APIRequestTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = ['msg91'];
+  protected static $modules = ['msg91'];
 
   /**
    * A user with permission to administer site configuration.
@@ -34,7 +34,7 @@ class APIRequestTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  protected function setUp() {
+  protected function setUp(): void {
     parent::setUp();
     $this->user = $this->drupalCreateUser(['administer msg91']);
     $this->drupalLogin($this->user);
@@ -54,7 +54,7 @@ class APIRequestTest extends BrowserTestBase {
       'msg91_country_code' => 91,
       'msg91_auth_url' => 'https://control.msg91.com/api/validate.php?authkey='
     ];
-    $this->drupalPostForm(NULL, $configuration_data, 'Save configuration');
+    $this->submitForm($configuration_data, 'Save configuration');
 
     //Initiate message sending service.
     $send_sms = \Drupal::service('msg91.default');
diff --git a/tests/src/Functional/LoadTest.php b/tests/src/Functional/LoadTest.php
index 4cb1c40..e24c80e 100644
--- a/tests/src/Functional/LoadTest.php
+++ b/tests/src/Functional/LoadTest.php
@@ -17,7 +17,7 @@ class LoadTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = ['msg91'];
+  protected static $modules = ['msg91'];
 
   /**
    * A user with permission to administer site configuration.
@@ -29,7 +29,7 @@ class LoadTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  protected function setUp() {
+  protected function setUp(): void {
     parent::setUp();
     $this->user = $this->drupalCreateUser(['administer site configuration']);
     $this->drupalLogin($this->user);