CustomerQuoteTest.php

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<?php
namespace Magento\Sales\Observer\Backend;

use Magento\Customer\Api\CustomerRepositoryInterface;
use Magento\Customer\Api\Data\CustomerInterface;
use Magento\Customer\Model\CustomerRegistry;
use Magento\Quote\Model\Quote;
use Magento\TestFramework\Helper\Bootstrap;

class CustomerQuoteTest extends \PHPUnit\Framework\TestCase
{
    public function testCustomerSaveQuoteObserver()
    {
        $repository = Bootstrap::getObjectManager()->create(\Magento\Customer\Api\CustomerRepositoryInterface::class);
        $registry = Bootstrap::getObjectManager()->create(\Magento\Customer\Model\CustomerRegistry::class);
        $customer = $repository->getById($registry->retrieveByEmail('[email protected]')->getId());

        $quote = Bootstrap::getObjectManager()->create(\Magento\Quote\Model\Quote::class);
        $quote->load('test01', 'reserved_order_id');
        $quote->setCustomerIsGuest(false)->setCustomerId($customer->getId())
            ->setCustomerGroupId($customer->getGroupId())
            ->save();

        $this->assertNotNull($customer->getGroupId(), "Precondition failed: Customer group is not set.");
        $this->assertEquals(
            $customer->getGroupId(),
            $quote->getCustomerGroupId(),
            "Precondition failed: Customer group in quote is invalid."
        );

        $newCustomerGroupId = 2;
        $customer->setGroupId($newCustomerGroupId);
        $repository->save($customer);

        $quote->load('test01', 'reserved_order_id');
        $this->assertEquals(
            $newCustomerGroupId,
            $quote->getCustomerGroupId(),
            'Customer group in quote was not updated on "customer_save_after_data_object" event ' .
            'by Magento\Sales\Model\Observer\Backend\CustomerQuote::dispatch().'
        );
    }
}