OutputBambooTest.php

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<?php
namespace Magento\Test\Profiler;

require_once __DIR__ . '/OutputBambooTestFilter.php';
class OutputBambooTest extends \PHPUnit\Framework\TestCase
{
    protected $_output;

    public static function setUpBeforeClass()
    {
        stream_filter_register('dataCollectorFilter', \Magento\Test\Profiler\OutputBambooTestFilter::class);
    }

    protected function setUp()
    {
        \Magento\Test\Profiler\OutputBambooTestFilter::resetCollectedData();

        $this->_output = new \Magento\TestFramework\Profiler\OutputBamboo(
            [
                'filePath' => 'php://filter/write=dataCollectorFilter/resource=php://memory',
                'metrics' => ['sample metric (ms)' => ['profiler_key_for_sample_metric']],
            ]
        );
    }

    public function testDisplay()
    {
        $this->_output->display(new \Magento\Framework\Profiler\Driver\Standard\Stat());
        \Magento\Test\Profiler\OutputBambooTestFilter::assertCollectedData("Timestamp,\"sample metric (ms)\"\n%d,%d");
    }
}