public function testIsOnly()
{
$collection = new ResourceIdentifierCollection();
$this->assertTrue($collection->isOnly($this->a->getType()));
$collection->add($this->a);
$this->assertTrue($collection->isOnly($this->a->getType()));
$collection->add($this->b);
$this->assertFalse($collection->isOnly($this->a->getType()));
$this->assertFalse($collection->isOnly($this->b->getType()));
$this->assertTrue($collection->isOnly([$this->a->getType(), $this->b->getType()]));
}
/**
* @inheritDoc
*/
public function getIdentifiers()
{
$collection = new ResourceIdentifierCollection();
/** @var ResourceInterface $resource */
foreach ($this as $resource) {
$collection->add($resource->getIdentifier());
}
return $collection;
}
