RuntimeTest.php

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<?php
namespace Magento\Framework\ObjectManager\Test\Unit\Relations;

require_once __DIR__ . '/../_files/Child.php';

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

    protected function setUp()
    {
        $this->model = new \Magento\Framework\ObjectManager\Relations\Runtime();
    }

    public function testGetParents($type, $parents)
    {
        $this->assertEquals($parents, $this->model->getParents($type));
    }

    public function getParentsDataProvider()
    {
        return [
            [\Magento\Test\Di\DiInterface::class, []],
            [\Magento\Test\Di\DiParent::class, [null, \Magento\Test\Di\DiInterface::class]],
            [\Magento\Test\Di\Child::class, [\Magento\Test\Di\DiParent::class, \Magento\Test\Di\ChildInterface::class]]
        ];
    }

    public function testHasIfNonExists()
    {
        $this->assertFalse($this->model->has(\NonexistentClass::class));
    }
}