public function testShowValue()
{
$object = new Series();
$this->assertInstanceOf('PhpOffice\\PhpPresentation\\Shape\\Chart\\Series', $object->setShowValue(true));
$this->assertTrue($object->hasShowValue());
$this->assertInstanceOf('PhpOffice\\PhpPresentation\\Shape\\Chart\\Series', $object->setShowValue(false));
$this->assertFalse($object->hasShowValue());
}