CollectionUpdaterTest.php

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<?php
namespace Magento\Sales\Test\Unit\Model\Grid\Child;

class CollectionUpdaterTest extends \PHPUnit\Framework\TestCase
{
    protected $collectionUpdater;

    protected $registryMock;

    protected function setUp()
    {
        $this->registryMock = $this->createMock(\Magento\Framework\Registry::class);

        $this->collectionUpdater = new \Magento\Sales\Model\Grid\Child\CollectionUpdater(
            $this->registryMock
        );
    }

    public function testUpdateIfOrderExists()
    {
        $collectionMock = $this->createMock(
            \Magento\Sales\Model\ResourceModel\Order\Payment\Transaction\Collection::class
        );
        $transactionMock = $this->createMock(\Magento\Sales\Model\Order\Payment\Transaction::class);
        $this->registryMock
            ->expects($this->once())
            ->method('registry')
            ->with('current_transaction')
            ->will($this->returnValue($transactionMock));
        $transactionMock->expects($this->once())->method('getId')->will($this->returnValue('transactionId'));
        $collectionMock->expects($this->once())->method('addParentIdFilter')->will($this->returnSelf());
        $this->assertEquals($collectionMock, $this->collectionUpdater->update($collectionMock));
    }
}