PagingTest.php

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<?php
namespace Magento\Ui\Test\Unit\Component;

use Magento\Ui\Component\Paging;
use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
use Magento\Framework\View\Element\UiComponent\ContextInterface;
use Magento\Framework\View\Element\UiComponent\DataProvider\DataProviderInterface;

class PagingTest extends \PHPUnit\Framework\TestCase
{
    protected $contextMock;

    protected $objectManager;

    protected function setUp()
    {
        $this->objectManager = new ObjectManager($this);

        $this->contextMock = $this->getMockForAbstractClass(
            \Magento\Framework\View\Element\UiComponent\ContextInterface::class,
            [],
            '',
            false,
            true,
            true,
            []
        );
    }

    public function testGetComponentName()
    {
        $this->contextMock->expects($this->never())->method('getProcessor');
        $paging = $this->objectManager->getObject(
            \Magento\Ui\Component\Paging::class,
            [
                'context' => $this->contextMock,
                'data' => []
            ]
        );

        $this->assertTrue($paging->getComponentName() === Paging::NAME);
    }

    public function testPrepare()
    {
        $processor = $this->getMockBuilder(\Magento\Framework\View\Element\UiComponent\Processor::class)
            ->disableOriginalConstructor()
            ->getMock();
        $this->contextMock->expects($this->atLeastOnce())->method('getProcessor')->willReturn($processor);
        $resultData = [
            'js_config' => [
                'extends' => 'test_config_extends',
                'testData' => 'testValue'
            ],
            'config' => [
                'options' => [
                    [
                        'value' => 20,
                        'label' => 20
                    ],
                    [
                        'value' => 30,
                        'label' => 30
                    ],
                    [
                        'value' => 50,
                        'label' => 50
                    ],
                    [
                        'value' => 100,
                        'label' => 100
                    ],
                    [
                        'value' => 200,
                        'label' => 200
                    ],
                    [
                        'value' => 20,
                        'label' => 'options1'
                    ],
                    [
                        'value' => 40,
                        'label' => 'options2'
                    ],
                ],
                'pageSize' => 20,
                'current' => 2
            ]
        ];

        $paging = $this->objectManager->getObject(
            \Magento\Ui\Component\Paging::class,
            [
                'context' => $this->contextMock,
                'data' => [
                    'js_config' => [
                        'extends' => 'test_config_extends',
                        'testData' => 'testValue',
                    ],
                    'config' => [
                        'options' => [
                            'options1' => [
                                'label' => 'options1',
                                'value' => '20'
                            ],
                            'options2' => [
                                'label' => 'options2',
                                'value' => '40'
                            ]
                        ],
                        'current' => 2,
                        'pageSize' => 20
                    ]
                ]
            ]
        );
        $dataProviderMock = $this->getMockBuilder(DataProviderInterface::class)->getMockForAbstractClass();

        $this->contextMock->expects($this->once())
            ->method('getRequestParam')
            ->with('paging')
            ->willReturn(['pageSize' => 5, 'current' => 3]);
        $this->contextMock->expects($this->once())
            ->method('getDataProvider')
            ->willReturn($dataProviderMock);

        $dataProviderMock->expects($this->once())
            ->method('setLimit')
            ->with(3, 5);

        $this->contextMock->expects($this->once())
            ->method('addComponentDefinition')
            ->with($paging->getComponentName(), ['extends' => 'test_config_extends', 'testData' => 'testValue']);

        $paging->prepare();

        $this->assertEquals($paging->getData(), $resultData);
    }
}