Browscap\Writer\CsvWriter::renderAllDivisionsHeader PHP Method

    public function renderAllDivisionsHeader(DataCollection $collection)
    {
        $division = $collection->getDefaultProperties();
        $ua = $division->getUserAgents();
        if (empty($ua[0]['properties']) || !is_array($ua[0]['properties'])) {
            return $this;
        }
        $defaultproperties = $ua[0]['properties'];
        $properties = array_merge(['PropertyName', 'MasterParent', 'LiteMode', 'Parent'], array_keys($defaultproperties));
        $values = [];
        foreach ($properties as $property) {
            if (!isset($this->outputProperties[$property])) {
                $this->outputProperties[$property] = $this->getFilter()->isOutputProperty($property, $this);
            }
            if (!$this->outputProperties[$property]) {
                continue;
            }
            $values[] = $this->getFormatter()->formatPropertyName($property);
        }
        fputs($this->file, implode(',', $values) . PHP_EOL);
        return $this;
    }

 /**
  * tests rendering the header for all division
  *
  * @group writer
  * @group sourcetest
  */
 public function testRenderAllDivisionsHeaderWithoutProperties()
 {
     $division = $this->getMockBuilder(\Browscap\Data\Division::class)->disableOriginalConstructor()->setMethods(['getUserAgents'])->getMock();
     $division->expects(self::once())->method('getUserAgents')->will(self::returnValue([]));
     $collection = $this->getMockBuilder(\Browscap\Data\DataCollection::class)->disableOriginalConstructor()->setMethods(['getDefaultProperties'])->getMock();
     $collection->expects(self::once())->method('getDefaultProperties')->will(self::returnValue($division));
     self::assertSame($this->object, $this->object->renderAllDivisionsHeader($collection));
     self::assertSame('', file_get_contents($this->file));
 }