AC-15105: [CE] PHPUnit 12: Upgrade Payment & Shipping related test cases

Author: shashi011

lib/internal/Magento/Framework/TestFramework/Unit/Helper/MockCreationTrait.php

@@ -0,0 +1,45 @@
+<?php
+/**
+ * Copyright 2025 Adobe
+ * All Rights Reserved.
+ */
+declare(strict_types=1);
+
+namespace Magento\Framework\TestFramework\Unit\Helper;
+
+use PHPUnit\Framework\MockObject\MockObject;
+use ReflectionClass;
+
+/**
+ * Trait for creating partial mocks with reflection for PHPUnit 12 migration
+ *
+ * Provides helper methods for creating mocks when standard PHPUnit methods are insufficient
+ */
+trait MockCreationTrait
+{
+    /**
+     * Create a partial mock with reflection.
+     *
+     * Use this when you need to mock methods that don't exist in the class/interface
+     * and cannot use standard createPartialMock() which would throw CannotUseOnlyMethodsException.
+     *
+     * @param string $className
+     * @param array $methods Methods to mock
+     * @return MockObject
+     */
+    protected function createPartialMockWithReflection(string $className, array $methods): MockObject
+    {
+        $reflection = new ReflectionClass($this);
+        $getMockBuilderMethod = $reflection->getMethod('getMockBuilder');
+        $getMockBuilderMethod->setAccessible(true);
+        $mockBuilder = $getMockBuilderMethod->invoke($this, $className);
+
+        $builderReflection = new ReflectionClass($mockBuilder);
+        $methodsProperty = $builderReflection->getProperty('methods');
+        $methodsProperty->setAccessible(true);
+        $methodsProperty->setValue($mockBuilder, $methods);
+
+        $mockBuilder->disableOriginalConstructor();
+        return $mockBuilder->getMock();
+    }
+}