/**
* @return array
*/
public function toArray()
{
return $this->shipmentProviders->toArray();
}
/**
* @expectedException \InvalidArgumentException
* @expectedExceptionMessage Value is not an instance of ShipmentProvider
*/
public function testAddInvalidShipmentProviderShouldThrowInvalidArgumentException()
{
$collection = new ShipmentProviderCollection();
$collection->add(1);
}
