diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Customer/CreateCustomerTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Customer/CreateCustomerTest.php
index 0be968d6d340..ce635cc20401 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Customer/CreateCustomerTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Customer/CreateCustomerTest.php
@@ -13,7 +13,7 @@
 use Magento\TestFramework\TestCase\GraphQlAbstract;
 
 /**
- * Test for create customer functionallity
+ * Test for create customer functionality
  */
 class CreateCustomerTest extends GraphQlAbstract
 {
@@ -27,7 +27,10 @@ class CreateCustomerTest extends GraphQlAbstract
      */
     private $customerRepository;
 
-    protected function setUp()
+    /**
+     * Sets up the initial tests params
+     */
+    protected function setUp(): void
     {
         parent::setUp();
 
@@ -308,7 +311,10 @@ public function testCreateCustomerSubscribed()
         $this->assertEquals(false, $response['createCustomer']['customer']['is_subscribed']);
     }
 
-    public function tearDown()
+    /**
+     * Delete created customer account after a test is executed.
+     */
+    public function tearDown(): void
     {
         $newEmail = 'new_customer@example.com';
         try {
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php
index f7ba5b4d924f..2ee12b6da0eb 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php
@@ -29,7 +29,10 @@ class AddSimpleProductToCartTest extends GraphQlAbstract
      */
     private $getMaskedQuoteIdByReservedOrderId;
 
-    protected function setUp()
+    /**
+     * Sets up the initial tests params
+     */
+    protected function setUp(): void
     {
         $objectManager = Bootstrap::getObjectManager();
         $this->customerTokenService = $objectManager->get(CustomerTokenServiceInterface::class);