function testDeleteAssociatedItems()
 {
     $collection_name = "Star Wars Cards";
     $test_collection = new Collection($collection_name);
     $test_collection->save();
     $collection_id = $test_collection->getId();
     $item_name = "Boba Fett";
     $test_item = new Item($item_name, $collection_id);
     $test_item->save();
     $item_name2 = "Slave 1";
     $test_item2 = new Item($item_name2, $collection_id);
     $test_item2->save();
     // Act
     $test_collection->deleteAssociatedItems();
     // Assert
     $this->assertEquals([], Item::getAll());
 }