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));
 }