AC-10528:Fix for Order Invoice Comment

Author: Devika-GL

app/code/Magento/Sales/Test/Unit/Controller/Adminhtml/Order/Invoice/AddCommentTest.php

@@ -105,7 +105,7 @@ class AddCommentTest extends TestCase
     /**
      * @var Escaper|MockObject
      */
-    protected $escaper;
+    private $escaper;
 
     /**
      * SetUp method

dev/tests/integration/testsuite/Magento/Sales/Controller/Adminhtml/Order/Invoice/AddCommentTest.php

@@ -9,6 +9,8 @@
 
 use PHPUnit\Framework\Constraint\RegularExpression;
 use PHPUnit\Framework\Constraint\StringContains;
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\Framework\Escaper;
 
 /**
  * Class verifies invoice add comment functionality.
@@ -40,8 +42,8 @@ public function testSendEmailOnAddInvoiceComment(): void
 
         $html = $this->getResponse()->getBody();
 
-        $escaper = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()
-            ->get(\Magento\Framework\Escaper::class);
+        $escaper = Bootstrap::getObjectManager()
+            ->get(Escaper::class);
 
         $this->assertStringContainsString($escaper->escapeHtml($comment), $html);