diff --git a/dev/tests/unit/Magento/FunctionalTestFramework/DataGenerator/Handlers/SecretStorage/FileStorageTest.php b/dev/tests/unit/Magento/FunctionalTestFramework/DataGenerator/Handlers/SecretStorage/FileStorageTest.php
index 62cb9798e..be97e04ab 100644
--- a/dev/tests/unit/Magento/FunctionalTestFramework/DataGenerator/Handlers/SecretStorage/FileStorageTest.php
+++ b/dev/tests/unit/Magento/FunctionalTestFramework/DataGenerator/Handlers/SecretStorage/FileStorageTest.php
@@ -3,29 +3,38 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace tests\unit\Magento\FunctionalTestFramework\DataGenerator\Handlers\SecretStorage;
 
 use Magento\FunctionalTestingFramework\DataGenerator\Handlers\SecretStorage\FileStorage;
+use ReflectionClass;
 use tests\unit\Util\MagentoTestCase;
-use AspectMock\Test as AspectMock;
 
 class FileStorageTest extends MagentoTestCase
 {
-
     /**
      * Test basic encryption/decryption functionality in FileStorage class.
      */
-    public function testBasicEncryptDecrypt()
+    public function testBasicEncryptDecrypt(): void
     {
         $testKey = 'magento/myKey';
         $testValue = 'myValue';
-
-        AspectMock::double(FileStorage::class, [
-            'readInCredentialsFile' => ["$testKey=$testValue"]
-        ]);
+        $creds = ["$testKey=$testValue"];
 
         $fileStorage = new FileStorage();
+        $reflection = new ReflectionClass(FileStorage::class);
+
+        // Emulate initialize() function result with the test credentials
+        $reflectionMethod = $reflection->getMethod('encryptCredFileContents');
+        $reflectionMethod->setAccessible(true);
+        $secretData = $reflectionMethod->invokeArgs($fileStorage, [$creds]);
+
+        // Set encrypted test credentials to the private 'secretData' property
+        $reflectionProperty = $reflection->getProperty('secretData');
+        $reflectionProperty->setAccessible(true);
+        $reflectionProperty->setValue($fileStorage, $secretData);
+
         $encryptedCred = $fileStorage->getEncryptedValue($testKey);
 
         // assert the value we've gotten is in fact not identical to our test value
diff --git a/src/Magento/FunctionalTestingFramework/DataGenerator/Handlers/CredentialStore.php b/src/Magento/FunctionalTestingFramework/DataGenerator/Handlers/CredentialStore.php
index d6e6b9a69..36b2daf41 100644
--- a/src/Magento/FunctionalTestingFramework/DataGenerator/Handlers/CredentialStore.php
+++ b/src/Magento/FunctionalTestingFramework/DataGenerator/Handlers/CredentialStore.php
@@ -221,11 +221,13 @@ private function initializeCredentialStorage()
      *
      * @return void
      */
-    private function initializeFileStorage()
+    private function initializeFileStorage(): void
     {
         // Initialize file storage
         try {
-            $this->credStorage[self::ARRAY_KEY_FOR_FILE]  = new FileStorage();
+            $fileStorage = new FileStorage();
+            $fileStorage->initialize();
+            $this->credStorage[self::ARRAY_KEY_FOR_FILE]  = $fileStorage;
         } catch (TestFrameworkException $e) {
             // Print error message in console
             print_r($e->getMessage());
diff --git a/src/Magento/FunctionalTestingFramework/DataGenerator/Handlers/SecretStorage/FileStorage.php b/src/Magento/FunctionalTestingFramework/DataGenerator/Handlers/SecretStorage/FileStorage.php
index be77a6de2..479c608e4 100644
--- a/src/Magento/FunctionalTestingFramework/DataGenerator/Handlers/SecretStorage/FileStorage.php
+++ b/src/Magento/FunctionalTestingFramework/DataGenerator/Handlers/SecretStorage/FileStorage.php
@@ -21,14 +21,17 @@ class FileStorage extends BaseStorage
     private $secretData = [];
 
     /**
-     * FileStorage constructor
+     * Initialize secret data value which represents encrypted credentials
+     *
+     * @return void
      * @throws TestFrameworkException
      */
-    public function __construct()
+    public function initialize(): void
     {
-        parent::__construct();
-        $creds = $this->readInCredentialsFile();
-        $this->secretData = $this->encryptCredFileContents($creds);
+        if (!$this->secretData) {
+            $creds = $this->readInCredentialsFile();
+            $this->secretData = $this->encryptCredFileContents($creds);
+        }
     }
 
     /**
@@ -36,10 +39,12 @@ public function __construct()
      *
      * @param string $key
      * @return string|null
+     * @throws TestFrameworkException
      */
-    public function getEncryptedValue($key)
+    public function getEncryptedValue($key): ?string
     {
-        $value = null;
+        $this->initialize();
+
         // Check if secret is in cached array
         if (null !== ($value = parent::getEncryptedValue($key))) {
             return $value;