CircularTest.php

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<?php
namespace Magento\Setup\Module\Dependency;

class CircularTest extends \PHPUnit\Framework\TestCase
{
    protected $circular;

    protected function setUp()
    {
        $this->circular = new Circular();
    }

    public function testBuildCircularDependencies()
    {
        $dependencies = [1 => [2], 2 => [3, 5], 3 => [1], 5 => [2]];
        $expectedCircularDependencies = [
            1 => [[1, 2, 3, 1]],
            2 => [[2, 3, 1, 2], [2, 5, 2]],
            3 => [[3, 1, 2, 3]],
            5 => [[5, 2, 5]],
        ];
        $this->assertEquals($expectedCircularDependencies, $this->circular->buildCircularDependencies($dependencies));
    }
}