ShardingTest.php

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<?php
namespace Magento\Framework\Setup\Test\Unit\Declaration\Schema;

use Magento\Framework\App\DeploymentConfig;
use Magento\Framework\TestFramework\Unit\Helper\ObjectManager as ObjectManagerHelper;

class ShardingTest extends \PHPUnit\Framework\TestCase
{
    private $model;

    private $objectManagerHelper;

    private $deploymentConfigMock;

    protected function setUp()
    {
        $this->deploymentConfigMock = $this->getMockBuilder(DeploymentConfig::class)
            ->disableOriginalConstructor()
            ->getMock();

        $this->objectManagerHelper = new ObjectManagerHelper($this);
        $this->model = $this->objectManagerHelper->getObject(
            \Magento\Framework\Setup\Declaration\Schema\Sharding::class,
            [
                'deploymentConfig' => $this->deploymentConfigMock,
                'resources' => ['default', 'checkout', 'sales']
            ]
        );
    }

    public function testCanUseResource()
    {
        $this->deploymentConfigMock->expects(self::once())
            ->method('get')
            ->with('db/connection')
            ->willReturn(['default']);
        self::assertFalse($this->model->canUseResource('checkout'));
    }

    public function testGetResources()
    {
        $this->deploymentConfigMock->expects(self::exactly(3))
            ->method('get')
            ->with('db/connection')
            ->willReturn(['default' => 1, 'sales' => 2, 'index' => 3]);
        self::assertEquals(['default', 'sales'], $this->model->getResources());
    }
}