ACP2E-2978: Saving product by admin user with different role scope overwrites/deletes existing Related product information in the product

Author: glanujnehra

app/code/Magento/Catalog/Test/Unit/Controller/Adminhtml/Product/Initialization/HelperTest.php

@@ -151,7 +151,7 @@ protected function setUp(): void
             ->disableOriginalConstructor()
             ->getMockForAbstractClass();
         $productExtensionAttributes = $this->getMockBuilder(ProductExtensionInterface::class)
-            ->onlyMethods(['getCategoryLinks', 'setCategoryLinks'])
+            ->addMethods(['getCategoryLinks', 'setCategoryLinks'])
             ->getMockForAbstractClass();
         $this->productMock->setExtensionAttributes($productExtensionAttributes);