mikehaertl\pdftk\Pdf::needAppearances PHP Méthode

    public function needAppearances()
    {
        $this->getCommand()->addOption('need_appearances');
        return $this;
    }

 public function testCanFillFormFromFile()
 {
     $form = $this->getForm();
     $fdf = $this->getFdf();
     $file = $this->getOutFile();
     $pdf = new Pdf($form);
     $this->assertInstanceOf('mikehaertl\\pdftk\\Pdf', $pdf->fillForm($fdf));
     $this->assertInstanceOf('mikehaertl\\pdftk\\Pdf', $pdf->needAppearances());
     $this->assertTrue($pdf->saveAs($file));
     $this->assertFileExists($file);
     $tmpFile = (string) $pdf->getTmpFile();
     $this->assertRegExp("#pdftk A='{$form}' fill_form '{$fdf}' output '{$tmpFile}' drop_xfa need_appearances#", (string) $pdf->getCommand());
 }