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()); }