WhichBrowser\Model\Device::getManufacturer PHP Method

    public function getManufacturer()
    {
        return $this->identified && !empty($this->manufacturer) ? $this->manufacturer : '';
    }

 public function testSetWithoutIdentified()
 {
     $device = new Device();
     $device->set(['manufacturer' => 'Microsoft', 'model' => 'Xbox One']);
     $this->assertEquals('', $device->getManufacturer());
     $this->assertEquals('Xbox One', $device->getModel());
     $this->assertEquals(true, $device->generic);
 }