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Editing File: /home/maglabs/it/dev/tests/integration/testsuite/Magento/Tax/Model/Rate/ProviderTest.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Tax\Model\Rate;

use Magento\Tax\Model\Calculation\Rate;
use Magento\Tax\Model\Rate\Provider;
use Magento\Tax\Model\ResourceModel\Calculation\Rate\Collection;
use Magento\TestFramework\Helper\Bootstrap;
use Magento\Framework\Api\SearchCriteriaBuilder;

/**
 * Class ProviderTest provides coverage
 * of Tax Rate model options provider.
 */
class ProviderTest extends \PHPUnit\Framework\TestCase
{
    /**
     * Test of requesting tax rates by search criteria.
     */
    public function testToOptionArray()
    {
        $objectManager = Bootstrap::getObjectManager();
        $optionsCount = 1;

/** @var Collection $collection */
        $collection = $objectManager->get(Collection::class);
        $expectedResult = [];

/** @var $taxRate Rate */
        foreach ($collection as $taxRate) {
            $expectedResult[] = ['value' => $taxRate->getId(), 'label' => $taxRate->getCode()];
            if (count($expectedResult) >= $optionsCount) {
                break;
            }
        }

/** @var Source $source */
        if (empty($expectedResult)) {
            $this->fail('Preconditions failed: At least one tax rate should be available.');
        }

$provider = $objectManager->get(Provider::class);

/** @var SearchCriteriaBuilder $searchCriteriaBuilder */
        $searchCriteriaBuilder =  $objectManager->create(SearchCriteriaBuilder::class);
        $searchCriteriaBuilder->setPageSize($optionsCount);
        $searchCriteriaBuilder->setCurrentPage(1);

$searchCriteria = $searchCriteriaBuilder->create();

$this->assertEquals(
            $expectedResult,
            $provider->toOptionArray($searchCriteria),
            'Tax rate options are invalid.'
        );
    }
}

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