CommandRendererBackgroundTest.php

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<?php
namespace Magento\Framework\Shell\Test\Unit;

use \Magento\Framework\Shell\CommandRendererBackground;

class CommandRendererBackgroundTest extends \PHPUnit\Framework\TestCase
{
    protected $testCommand = 'php -r test.php';

    protected $osInfo;

    protected function setUp()
    {
        $this->osInfo = $this->getMockBuilder(\Magento\Framework\OsInfo::class)->getMock();
    }

    public function testRender($isWindows, $expectedResults)
    {
        $this->osInfo->expects($this->once())
            ->method('isWindows')
            ->will($this->returnValue($isWindows));

        $commandRenderer = new CommandRendererBackground($this->osInfo);
        $this->assertEquals(
            $expectedResults,
            $commandRenderer->render($this->testCommand)
        );
    }

    public function commandPerOsTypeDataProvider()
    {
        return [
            'windows' => [true, 'start /B "magento background task" ' . $this->testCommand . ' 2>&1'],
            'unix'    => [false, $this->testCommand . ' > /dev/null &'],
        ];
    }
}