GroupKeyNotPresentInResultsetException A simple exception sub-class used throughout Dewdrop to make it easy to distinguish exceptions thrown by Dewdrop itself from those thrown by other libraries.
Mock A mock adapter that uses a mock wpdb connection with no actual connection to the database. Can be used when testing to ensure certain methods are called when you expecte them to be without actually hitting the MySQL database directly.
MockWpdb A mock wpdb class that doesn't ever interact with the DB directly. It simply lets you detect when certain methods are called during testing to ensure application logic is functioning as expected.