AvailabilityFlagTest.php

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<?php
namespace Magento\Catalog\Test\Unit\Model\Layer\Category;

use \Magento\Catalog\Model\Layer\Category\AvailabilityFlag;

class AvailabilityFlagTest extends \PHPUnit\Framework\TestCase
{
    protected $filters;

    protected $filterMock;

    protected $layerMock;

    protected $stateMock;

    protected $model;

    protected function setUp()
    {
        $this->filterMock = $this->createMock(\Magento\Catalog\Model\Layer\Filter\AbstractFilter::class);
        $this->filters = [$this->filterMock];
        $this->layerMock = $this->createMock(\Magento\Catalog\Model\Layer::class);
        $this->stateMock = $this->createMock(\Magento\Catalog\Model\Layer\State::class);
        $this->model = new AvailabilityFlag();
    }

    public function testIsEnabled($itemsCount, $filters, $expectedResult)
    {
        $this->layerMock->expects($this->any())->method('getState')->will($this->returnValue($this->stateMock));
        $this->stateMock->expects($this->any())->method('getFilters')->will($this->returnValue($filters));
        $this->filterMock->expects($this->once())->method('getItemsCount')->will($this->returnValue($itemsCount));

        $this->assertEquals($expectedResult, $this->model->isEnabled($this->layerMock, $this->filters));
    }

    public function isEnabledDataProvider()
    {
        return [
            [
                'itemsCount' => 0,
                'filters' => [],
                'expectedResult' => false,
            ],
            [
                'itemsCount' => 0,
                'filters' => ['filter'],
                'expectedResult' => true,
            ],
            [
                'itemsCount' => 1,
                'filters' => 0,
                'expectedResult' => true,
            ],
            [
                'itemsCount' => 1,
                'filters' => ['filter'],
                'expectedResult' => true,
            ]
        ];
    }
}