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dev/tests/integration/testsuite/Magento/Newsletter/Model/ResourceModel/SubscriberTest.php

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+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Newsletter\Model\ResourceModel;
+
+use Magento\TestFramework\Helper\Bootstrap;
+
+class SubscriberTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @var \Magento\Newsletter\Model\ResourceModel\Subscriber
+     */
+    protected $_resourceModel;
+
+    protected function setUp(): void
+    {
+        $this->_resourceModel = Bootstrap::getObjectManager()
+            ->create(\Magento\Newsletter\Model\ResourceModel\Subscriber::class);
+    }
+
+    /**
+     * @magentoDataFixture Magento/Newsletter/_files/subscribers.php
+     */
+    public function testLoadByCustomerDataWithCustomerId()
+    {
+        /** @var \Magento\Customer\Api\CustomerRepositoryInterface $customerRepository */
+        $customerRepository = Bootstrap::getObjectManager()
+            ->create(\Magento\Customer\Api\CustomerRepositoryInterface::class);
+        $customerData = $customerRepository->getById(1);
+        $result = $this->_resourceModel->loadByCustomerData($customerData);
+
+        $this->assertEquals(1, $result['customer_id']);
+        $this->assertEquals('customer@example.com', $result['subscriber_email']);
+    }
+
+    /**
+     * @magentoDataFixture Magento/Newsletter/_files/subscribers.php
+     * @magentoDataFixture Magento/Customer/_files/two_customers.php
+     */
+    public function testLoadByCustomerDataWithoutCustomerId()
+    {
+        /** @var \Magento\Customer\Api\CustomerRepositoryInterface $customerRepository */
+        $customerRepository = Bootstrap::getObjectManager()
+            ->create(\Magento\Customer\Api\CustomerRepositoryInterface::class);
+        $customerData = $customerRepository->getById(2);
+        $result = $this->_resourceModel->loadByCustomerData($customerData);
+
+        $this->assertEquals(0, $result['customer_id']);
+        $this->assertEquals('customer_two@example.com', $result['subscriber_email']);
+    }
+}