InitialSnapshotConfigSourceTest.php

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<?php
namespace Magento\Config\Test\Unit\App\Config\Source;

use Magento\Config\App\Config\Source\InitialSnapshotConfigSource;
use Magento\Framework\DataObject;
use Magento\Framework\DataObjectFactory;
use Magento\Framework\FlagManager;
use PHPUnit_Framework_MockObject_MockObject as Mock;

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

    private $flagManagerMock;

    private $dataObjectFactoryMock;

    private $dataObjectMock;

    protected function setUp()
    {
        $this->flagManagerMock = $this->getMockBuilder(FlagManager::class)
            ->disableOriginalConstructor()
            ->getMock();
        $this->dataObjectFactoryMock = $this->getMockBuilder(DataObjectFactory::class)
            ->setMethods(['create'])
            ->disableOriginalConstructor()
            ->getMock();
        $this->dataObjectMock = $this->getMockBuilder(DataObject::class)
            ->disableOriginalConstructor()
            ->getMock();

        $this->dataObjectFactoryMock->expects($this->any())
            ->method('create')
            ->willReturn($this->dataObjectMock);

        $this->model = new InitialSnapshotConfigSource(
            $this->flagManagerMock,
            $this->dataObjectFactoryMock
        );
    }

    public function testGet()
    {
        $this->flagManagerMock->expects($this->exactly(2))
            ->method('getFlagData')
            ->with('system_config_snapshot')
            ->willReturnOnConsecutiveCalls(
                ['some' => 'data'],
                'data'
            );
        $this->dataObjectMock->expects($this->exactly(2))
            ->method('getData')
            ->willReturnOnConsecutiveCalls(
                ['some' => 'data'],
                'data'
            );

        $this->assertSame(['some' => 'data'], $this->model->get());
        $this->assertSame('data', $this->model->get('some/path'));
    }
}