Fireguard\Report\Exporters\PdfExporter::configure PHP Method

    public function configure(array $config = [])
    {
        $this->extension = '.pdf';
        $defaultConfig = $this->getDefaultConfiguration();
        $this->config = array_replace_recursive($defaultConfig['pdf'], $config);
        $this->setConfigDefaultOptions($this->config['phantom']);
        $this->commandOptions = $this->configDefaultOptions;
        $this->setBinaryPath((new PhantomBinary())->getBin());
        return $this;
    }

 public function testGetHeaderHeight()
 {
     $exporter = new PdfExporter();
     $exporter->configure(['header' => ['height' => '0px']]);
     $this->assertEquals('0px', $exporter->getHeaderHeight());
     $exporter->configure(['header' => ['height' => '100px']]);
     $this->assertEquals('100px', $exporter->getHeaderHeight());
 }