Cover identity validator with integration tests

Author: nikolaevas

dev/tests/integration/testsuite/Magento/Framework/DataObject/IdentityValidatorTest.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Framework\DataObject;
+
+class IdentityValidatorTest extends \PHPUnit\Framework\TestCase
+{
+    const VALID_UUID = 'fe563e12-cf9d-4faf-82cd-96e011b557b7';
+    const INVALID_UUID = 'abcdef';
+
+    /**
+     * @var IdentityValidator
+     */
+    protected $identityValidator;
+
+    protected function setUp()
+    {
+        $this->identityValidator = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()
+            ->get(IdentityValidator::class);
+    }
+
+    public function testIsValid()
+    {
+        $isValid = $this->identityValidator->isValid(self::VALID_UUID);
+        $this->assertEquals(true, $isValid);
+    }
+
+    public function testIsNotValid()
+    {
+        $isValid = $this->identityValidator->isValid(self::INVALID_UUID);
+        $this->assertEquals(false, $isValid);
+    }
+
+    public function testEmptyValue()
+    {
+        $isValid = $this->identityValidator->isValid('');
+        $this->assertEquals(false, $isValid);
+    }
+}