CustomlayoutupdateTest.php

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<?php
namespace Magento\Catalog\Test\Unit\Model\Attribute\Backend;

use Magento\Framework\DataObject;
use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;

class CustomlayoutupdateTest extends \PHPUnit\Framework\TestCase
{
    private $attributeName = 'private';

    private $model;

    public function testValidateException()
    {
        $object = new DataObject();
        $object->setData($this->attributeName, 'exception');
        $this->model->validate($object);
    }

    public function testValidate($data)
    {
        $object = new DataObject();
        $object->setData($this->attributeName, $data);

        $this->assertTrue($this->model->validate($object));
        $this->assertTrue($this->model->validate($object));
    }

    public function validateProvider()
    {
        return [[''], ['xml']];
    }

    protected function setUp()
    {
        $helper = new ObjectManager($this);
        $this->model = $helper->getObject(
            \Magento\Catalog\Model\Attribute\Backend\Customlayoutupdate::class,
            [
                'layoutUpdateValidatorFactory' => $this->getMockedLayoutUpdateValidatorFactory()
            ]
        );
        $this->model->setAttribute($this->getMockedAttribute());
    }

    private function getMockedLayoutUpdateValidatorFactory()
    {
        $mockBuilder = $this->getMockBuilder(\Magento\Framework\View\Model\Layout\Update\ValidatorFactory::class);
        $mockBuilder->disableOriginalConstructor();
        $mockBuilder->setMethods(['create']);
        $mock = $mockBuilder->getMock();

        $mock->expects($this->any())
            ->method('create')
            ->will($this->returnValue($this->getMockedValidator()));

        return $mock;
    }

    private function getMockedValidator()
    {
        $mockBuilder = $this->getMockBuilder(\Magento\Framework\View\Model\Layout\Update\Validator::class);
        $mockBuilder->disableOriginalConstructor();
        $mock = $mockBuilder->getMock();

        $mock->expects($this->any())
            ->method('isValid')
            ->will(
                $this->returnCallback(
                    function ($xml) {
                        if ($xml == 'exception') {
                            return false;
                        } else {
                            return true;
                        }
                    }
                )
            );

        $mock->expects($this->any())
            ->method('getMessages')
            ->will($this->returnValue(['error']));

        return $mock;
    }

    private function getMockedAttribute()
    {
        $mockBuilder = $this->getMockBuilder(\Magento\Eav\Model\Entity\Attribute\AbstractAttribute::class);
        $mockBuilder->disableOriginalConstructor();
        $mock = $mockBuilder->getMock();

        $mock->expects($this->any())
            ->method('getName')
            ->will($this->returnValue($this->attributeName));

        $mock->expects($this->any())
            ->method('getIsRequired')
            ->will($this->returnValue(false));

        return $mock;
    }
}