public function test_can_add_new_element()
{
$deg = new Deg();
$deg->addDataElement('foobar');
$this->assertEquals('foobar', $deg->toString());
$deg->addDataElement('baz');
$this->assertEquals('foobar:baz', $deg->toString());
$this->assertEquals('foobar:baz', (string) $deg);
}
