diff --git a/tests/src/FunctionalJavascript/ExtlinkAdminTest.php b/tests/src/FunctionalJavascript/ExtlinkAdminTest.php
index f5d599c..d873059 100644
--- a/tests/src/FunctionalJavascript/ExtlinkAdminTest.php
+++ b/tests/src/FunctionalJavascript/ExtlinkAdminTest.php
@@ -33,12 +33,12 @@ class ExtlinkAdminTest extends ExtlinkTestBase {
     $this->drupalLogin($this->adminUser);
     $this->drupalGet(self::EXTLINK_ADMIN_PATH);
     $this->assertSession()->checkboxNotChecked('extlink_exclude_admin_routes');
-    $this->assertRaw('/extlink/extlink.js');
+    $this->assertSession()->responseContains('/extlink/extlink.js');
 
     // Disable Extlink on admin routes.
     $this->drupalGet(self::EXTLINK_ADMIN_PATH);
     $this->submitForm(['extlink_exclude_admin_routes' => TRUE], 'Save configuration');
-    $this->assertNoRaw('/extlink/extlink.js');
+    $this->assertSession()->responseNotContains('/extlink/extlink.js');
   }
 
 }
diff --git a/tests/src/FunctionalJavascript/ExtlinkExternalFileNoFollowTest.php b/tests/src/FunctionalJavascript/ExtlinkExternalFileNoFollowTest.php
index 97c4fda..c693da9 100644
--- a/tests/src/FunctionalJavascript/ExtlinkExternalFileNoFollowTest.php
+++ b/tests/src/FunctionalJavascript/ExtlinkExternalFileNoFollowTest.php
@@ -12,7 +12,7 @@ class ExtlinkExternalFileNoFollowTest extends ExtlinkTestNoFollow {
   /**
    * {@inheritdoc}
    */
-  public function setUp() {
+  public function setUp(): void {
     parent::setUp();
 
     // Enable the use of the external JS file.
diff --git a/tests/src/FunctionalJavascript/ExtlinkExternalFileTargetTest.php b/tests/src/FunctionalJavascript/ExtlinkExternalFileTargetTest.php
index a3257aa..ecac643 100644
--- a/tests/src/FunctionalJavascript/ExtlinkExternalFileTargetTest.php
+++ b/tests/src/FunctionalJavascript/ExtlinkExternalFileTargetTest.php
@@ -12,7 +12,7 @@ class ExtlinkExternalFileTargetTest extends ExtlinkTestTarget {
   /**
    * {@inheritdoc}
    */
-  public function setUp() {
+  public function setUp(): void {
     parent::setUp();
 
     // Enable the use of the external JS file.
diff --git a/tests/src/FunctionalJavascript/ExtlinkExternalFileTest.php b/tests/src/FunctionalJavascript/ExtlinkExternalFileTest.php
index b10518a..cc60f91 100644
--- a/tests/src/FunctionalJavascript/ExtlinkExternalFileTest.php
+++ b/tests/src/FunctionalJavascript/ExtlinkExternalFileTest.php
@@ -12,7 +12,7 @@ class ExtlinkExternalFileTest extends ExtlinkTest {
   /**
    * {@inheritdoc}
    */
-  public function setUp() {
+  public function setUp(): void {
     parent::setUp();
 
     // Enable the use of the external JS file.
diff --git a/tests/src/FunctionalJavascript/ExtlinkTestBase.php b/tests/src/FunctionalJavascript/ExtlinkTestBase.php
index 06fbb2f..cdf513c 100644
--- a/tests/src/FunctionalJavascript/ExtlinkTestBase.php
+++ b/tests/src/FunctionalJavascript/ExtlinkTestBase.php
@@ -23,7 +23,7 @@ abstract class ExtlinkTestBase extends WebDriverTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['extlink', 'node', 'filter', 'image'];
+  protected static $modules = ['extlink', 'node', 'filter', 'image'];
 
   /**
    * User with various administrative permissions.
@@ -69,7 +69,7 @@ abstract class ExtlinkTestBase extends WebDriverTestBase {
   /**
    * {@inheritdoc}
    */
-  public function setUp() {
+  public function setUp(): void {
     // Enable any module that you will need in your tests.
     parent::setUp();
     // Create a normal user.