public function testGridLines()
{
$object = new Axis();
$oMock = $this->getMock('PhpOffice\\PhpPresentation\\Shape\\Chart\\Gridlines');
$this->assertInstanceOf('PhpOffice\\PhpPresentation\\Shape\\Chart\\Axis', $object->setMajorGridlines($oMock));
$this->assertInstanceOf('PhpOffice\\PhpPresentation\\Shape\\Chart\\Gridlines', $object->getMajorGridlines());
$this->assertInstanceOf('PhpOffice\\PhpPresentation\\Shape\\Chart\\Axis', $object->setMinorGridlines($oMock));
$this->assertInstanceOf('PhpOffice\\PhpPresentation\\Shape\\Chart\\Gridlines', $object->getMinorGridlines());
}