ConfigTest.php

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<?php
namespace Magento\Analytics\Test\Unit\Model;

use Magento\Analytics\Model\Config;
use Magento\Framework\Config\DataInterface;
use Magento\Framework\TestFramework\Unit\Helper\ObjectManager as ObjectManagerHelper;

class ConfigTest extends \PHPUnit\Framework\TestCase
{
    private $dataInterfaceMock;

    private $objectManagerHelper;

    private $config;

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

        $this->objectManagerHelper = new ObjectManagerHelper($this);

        $this->config = $this->objectManagerHelper->getObject(
            Config::class,
            [
                'data' => $this->dataInterfaceMock,
            ]
        );
    }

    public function testGet()
    {
        $key = 'configKey';
        $defaultValue = 'mock';
        $configValue = 'emptyString';

        $this->dataInterfaceMock
            ->expects($this->once())
            ->method('get')
            ->with($key, $defaultValue)
            ->willReturn($configValue);

        $this->assertSame($configValue, $this->config->get($key, $defaultValue));
    }
}