ReportProductDeletedTest.php

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<?php
namespace Magento\NewRelicReporting\Test\Unit\Model\Observer;

use Magento\NewRelicReporting\Model\Observer\ReportProductDeleted;

class ReportProductDeletedTest extends \PHPUnit\Framework\TestCase
{
    protected $model;

    protected $config;

    protected $systemFactory;

    protected $systemModel;

    protected $jsonEncoder;

    protected function setUp()
    {
        $this->config = $this->getMockBuilder(\Magento\NewRelicReporting\Model\Config::class)
            ->disableOriginalConstructor()
            ->setMethods(['isNewRelicEnabled'])
            ->getMock();
        $this->systemFactory = $this->getMockBuilder(\Magento\NewRelicReporting\Model\SystemFactory::class)
            ->disableOriginalConstructor()
            ->setMethods(['create'])
            ->getMock();
        $this->systemModel = $this->getMockBuilder(\Magento\NewRelicReporting\Model\System::class)
            ->disableOriginalConstructor()
            ->getMock();
        $this->jsonEncoder = $this->getMockBuilder(\Magento\Framework\Json\EncoderInterface::class)
            ->getMock();
        $this->systemFactory->expects($this->any())
            ->method('create')
            ->willReturn($this->systemModel);

        $this->model = new ReportProductDeleted(
            $this->config,
            $this->systemFactory,
            $this->jsonEncoder
        );
    }

    public function testReportProductDeletedModuleDisabledFromConfig()
    {
        $eventObserver = $this->getMockBuilder(\Magento\Framework\Event\Observer::class)
            ->disableOriginalConstructor()
            ->getMock();
        $this->config->expects($this->once())
            ->method('isNewRelicEnabled')
            ->willReturn(false);

        $this->model->execute($eventObserver);
    }

    public function testReportProductDeleted()
    {
        $testType = 'adminProductChange';
        $testAction = 'JSON string';

        $eventObserver = $this->getMockBuilder(\Magento\Framework\Event\Observer::class)
            ->disableOriginalConstructor()
            ->getMock();
        $this->config->expects($this->once())
            ->method('isNewRelicEnabled')
            ->willReturn(true);
        $event = $this->getMockBuilder(\Magento\Framework\Event::class)
            ->setMethods(['getProduct'])
            ->disableOriginalConstructor()
            ->getMock();
        $eventObserver->expects($this->once())
            ->method('getEvent')
            ->willReturn($event);
        $product = $this->getMockBuilder(\Magento\Catalog\Model\Product::class)
            ->setMethods(['getId'])
            ->disableOriginalConstructor()
            ->getMock();
        $event->expects($this->once())
            ->method('getProduct')
            ->willReturn($product);
        $this->jsonEncoder->expects($this->once())
            ->method('encode')
            ->willReturn($testAction);
        $this->systemModel->expects($this->once())
            ->method('setData')
            ->with(['type' => $testType, 'action' => $testAction])
            ->willReturnSelf();
        $this->systemModel->expects($this->once())
            ->method('save');

        $this->model->execute($eventObserver);
    }
}