OutputBambooTestFilter.php

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<?php
namespace Magento\Test\Profiler;

class OutputBambooTestFilter extends \php_user_filter
{
    private static $_collectedData = '';

    public function filter($in, $out, &$consumed, $closing)
    {
        while ($bucket = stream_bucket_make_writeable($in)) {
            self::$_collectedData .= $bucket->data;
            $consumed += $bucket->datalen;
            stream_bucket_append($out, $bucket);
        }
        return PSFS_PASS_ON;
    }

    public static function resetCollectedData()
    {
        self::$_collectedData = '';
    }

    public static function assertCollectedData($expectedData)
    {
        \PHPUnit\Framework\Assert::assertStringMatchesFormat(
            $expectedData,
            self::$_collectedData,
            'Expected data went through the stream.'
        );
    }
}