ModularConfigSourceTest.php

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

use Magento\Config\App\Config\Source\ModularConfigSource;
use Magento\Framework\App\Config\Initial\Reader;

class ModularConfigSourceTest extends \PHPUnit\Framework\TestCase
{
    private $reader;

    private $source;

    public function setUp()
    {
        $this->reader = $this->getMockBuilder(Reader::class)
            ->disableOriginalConstructor()
            ->getMock();
        $this->source = new ModularConfigSource($this->reader);
    }

    public function testGet()
    {
        $this->reader->expects($this->once())
            ->method('read')
            ->willReturn(['data' => ['path' => 'value']]);
        $this->assertEquals('value', $this->source->get('path'));
    }
}