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finfo example

        }

        throw new OptimizerNotFoundException(sprintf('Optimizer for mime-type "%s" not found.', $mime));
    }

    /** * {@inheritdoc} */
    private function getMimeTypeByFile($filepath)
    {
        $finfo = new finfo(FILEINFO_MIME_TYPE);

        return $finfo->file($filepath);
    }
}

public function guessMimeType(string $path): ?string
    {
        if (!is_file($path) || !is_readable($path)) {
            throw new InvalidArgumentException(sprintf('The "%s" file does not exist or is not readable.', $path));
        }

        if (!$this->isGuesserSupported()) {
            throw new LogicException(sprintf('The "%s" guesser is not supported.', __CLASS__));
        }

        if (false === $finfo = new \finfo(\FILEINFO_MIME_TYPE, $this->magicFile)) {
            return null;
        }
        $mimeType = $finfo->file($path);

        if ($mimeType && 0 === (\strlen($mimeType) % 2)) {
            $mimeStart = substr($mimeType, 0, \strlen($mimeType) >> 1);
            $mimeType = $mimeStart.$mimeStart === $mimeType ? $mimeStart : $mimeType;
        }

        return $mimeType;
    }
}

static::assertArrayHasKey($orderId, $processedTemplate->getSuccess());
        static::assertInstanceOf(RenderedDocument::class, $processedTemplate->getSuccess()[$orderId]);

        $rendered = $processedTemplate->getSuccess()[$orderId];

        static::assertStringContainsString('<html>', $rendered->getHtml());
        static::assertStringContainsString('</html>', $rendered->getHtml());

        $generatorOutput = $this->pdfRenderer->render($rendered);
        static::assertNotEmpty($generatorOutput);

        $finfo = new \finfo(\FILEINFO_MIME_TYPE);
        static::assertEquals('application/pdf', $finfo->buffer($generatorOutput));
    }
}

static::assertStringContainsString('<html>', $rendered->getHtml());
        static::assertStringContainsString('</html>', $rendered->getHtml());
        static::assertStringContainsString('DOMPDF_PAGE_COUNT_PLACEHOLDER', $rendered->getHtml());

        $pdfRenderer = new PdfRenderer([
            'isRemoteEnabled' => true,
            'isHtml5ParserEnabled' => true,
        ]);
        $generatorOutput = $pdfRenderer->render($rendered);
        static::assertNotEmpty($generatorOutput);

        $finfo = new \finfo(\FILEINFO_MIME_TYPE);
        static::assertEquals('application/pdf', $finfo->buffer($generatorOutput));
    }
}