RelationCompositeTest.php

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<?php
namespace Magento\Framework\Model\Test\Unit\ResourceModel\Db\VersionControl;

class RelationCompositeTest extends \PHPUnit\Framework\TestCase
{
    protected $entityRelationComposite;

    protected $modelMock;

    protected $relationProcessorMock;

    protected $eventManagerMock;

    protected function setUp()
    {
        $this->modelMock = $this->getMockBuilder(\Magento\Framework\Model\AbstractModel::class)
            ->disableOriginalConstructor()
            ->setMethods(
                [
                    'getEventPrefix'
                ]
            )
            ->getMockForAbstractClass();
        $this->relationProcessorMock = $this->getMockBuilder(\Magento\Framework\Model\AbstractModel::class)
            ->disableOriginalConstructor()
            ->getMockForAbstractClass();
        $this->eventManagerMock = $this->getMockBuilder(\Magento\Framework\Event\ManagerInterface::class)
            ->disableOriginalConstructor()
            ->getMockForAbstractClass();
        $this->relationProcessorMock = $this->getMockBuilder(
            \Magento\Framework\Model\ResourceModel\Db\VersionControl\RelationInterface::class
        )->disableOriginalConstructor()->getMockForAbstractClass();

        $this->entityRelationComposite = new \Magento\Framework\Model\ResourceModel\Db\VersionControl\RelationComposite(
            $this->eventManagerMock,
            [
                'default' => $this->relationProcessorMock
            ]
        );
    }

    public function testProcessRelations()
    {
        $this->relationProcessorMock->expects($this->once())
            ->method('processRelation')
            ->with($this->modelMock);
        $this->modelMock->expects($this->once())
            ->method('getEventPrefix')
            ->willReturn('custom_event_prefix');
        $this->eventManagerMock->expects($this->once())
            ->method('dispatch')
            ->with(
                'custom_event_prefix_process_relation',
                [
                    'object' => $this->modelMock
                ]
            );
        $this->entityRelationComposite->processRelations($this->modelMock);
    }
}