Issue magento#35852 Add Unit test

app/code/Magento/SalesGraphQl/Test/Unit/Model/Resolver/OrdersTest.php

@@ -0,0 +1,106 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\SalesGraphQl\Test\Unit\Model\Resolver;
+
+use Magento\GraphQl\Model\Query\ContextInterface;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Magento\Sales\Model\ResourceModel\Order\CollectionFactoryInterface;
+use Magento\SalesGraphQl\Model\Resolver\Orders;
+use Magento\Sales\Model\ResourceModel\Order\Collection;
+use Magento\Sales\Model\Order;
+
+class OrdersTest extends TestCase
+{
+    /**
+     * @var Orders
+     */
+    private $resolver;
+
+    /**
+     * @var ContextInterface|MockObject
+     */
+    private $contextMock;
+
+    /**
+     * @var CollectionFactoryInterface|MockObject
+     */
+    private $collectionFactoryInterfaceMock;
+
+    protected function setUp(): void
+    {
+        $this->contextMock = $this->createMock(ContextInterface::class);
+
+        $this->collectionFactoryInterfaceMock = $this->getMockBuilder(CollectionFactoryInterface::class)
+            ->getMock();
+
+        $this->resolver = new Orders(
+            $this->collectionFactoryInterfaceMock,
+        );
+    }
+
+    public function testResolve(): void
+    {
+        $collectionMock = $this->getMockBuilder(Collection::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+        $orderMock = $this->createMock(Order::class);
+
+        $collectionMock->method('getIterator')
+            ->willReturn(new \ArrayObject([$orderMock]));
+
+        $this->contextMock
+            ->method('getUserId')
+            ->willReturn(1);
+
+        $this->collectionFactoryInterfaceMock
+            ->method('create')
+            ->willReturn($collectionMock);
+
+        $result = $this->resolver->resolve(
+            $this->getFieldStub(),
+            $this->contextMock,
+            $this->getResolveInfoStub(),
+            null
+        );
+
+        $this->assertIsArray($result);
+        $assertKeys = [
+            'id',
+            'increment_id',
+            'order_number',
+            'created_at',
+            'grand_total',
+            'status',
+            'model'
+        ];
+        foreach ($assertKeys as $key) {
+            $this->assertArrayHasKey($key, current($result['items']));
+        }
+        $this->assertEquals($orderMock, current($result['items'])['model']);
+    }
+
+    /**
+     * @return MockObject|Field
+     */
+    private function getFieldStub(): Field
+    {
+        return $this->createMock(Field::class);
+    }
+
+    /**
+     * @return MockObject|ResolveInfo
+     */
+    private function getResolveInfoStub(): ResolveInfo
+    {
+        /** @var MockObject|ResolveInfo $resolveInfoMock */
+        return $this->createMock(ResolveInfo::class);
+    }
+}