/**
* @param mixed $value
*
* @return $this
*/
public function add($value)
{
if (!$value instanceof NodeInterface) {
throw new InvalidArgumentException("The specified value does not implement NodeInterface");
}
return parent::add($value);
}
public function testAddDuplicate()
{
$coll = new Collection(['foo', 'bar', 'baz']);
$result = $coll->add('baz');
$this->assertEquals(['foo', 'bar', 'baz', 'baz'], $coll->getAll());
$this->assertSame($coll, $result);
}
/**
* @param mixed $value
*/
protected function addItem($value)
{
parent::add($value);
}
