function testGetCollectionId() { // Arrange $collection_name = "Basketball cards"; $test_collection = new Collection($collection_name); $test_collection->save(); $test_collection_id = $test_collection->getId(); $item_name = "MJ Rookie Card"; $test_item = new Item($item_name, $test_collection_id); $test_item->save(); // Act $result = $test_item->getCollectionId(); // Assert $this->assertEquals(true, is_numeric($result)); }