ACP2E-782: Introduce an alternative way to define fixtures using PHP8 Attributes

Author: bubasuma

dev/tests/integration/framework/tests/unit/testsuite/Magento/Test/Annotation/ConfigFixtureTest.php

@@ -45,6 +45,13 @@ function (string $type) {
                 }
             );
 
+        $objectManager->method('get')
+            ->willReturnCallback(
+                function (string $type) {
+                    return $this->createMock($type);
+                }
+            );
+
         Bootstrap::setObjectManager($objectManager);
 
         $this->object = $this->createPartialMock(