unit test added

Author: glo00108

dev/tests/unit/Magento/FunctionalTestFramework/DataGenerator/Handlers/SecretStorage/FileStorageTest.php

@@ -45,4 +45,37 @@ public function testBasicEncryptDecrypt(): void
         // assert that we are able to successfully decrypt our secret value
         $this->assertEquals($testValue, $actualValue);
     }
+
+    /**
+     * Test empty value encryption/decryption functionality in FileStorage class.
+     */
+    public function testEmptyValueEncryptDecrypt(): void
+    {
+      $testKey = 'magento/myKey';
+      $testValue = '';
+      $creds = ["$testKey"];
+
+      $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
+      $this->assertNotEquals($testValue, $encryptedCred);
+
+      $actualValue = $fileStorage->getDecryptedValue($encryptedCred);
+
+      // assert that we are able to successfully decrypt our secret value
+      $this->assertEquals($testValue, $actualValue);
+    }
 }