| Class | PGNotReadyError | Undocumented |
| Class | PGBouncerFixture | Inserts a controllable pgbouncer instance in front of PostgreSQL. |
| Class | ZopeAdapterFixture | A fixture to register and unregister an adapter. |
| Class | ZopeEventHandlerFixture | A fixture that provides and then unprovides a Zope event handler. |
| Class | ZopeViewReplacementFixture | A fixture that allows you to temporarily replace one view with another. |
| Class | ZopeUtilityFixture | A fixture that temporarily registers a different utility. |
| Class | Urllib2Fixture | Let tests use urllib to connect to an in-process Launchpad. |
| Class | CaptureOops | Capture OOPSes notified via zope event notification. |
| Class | CaptureTimeline | Record and return the timeline. |
| Class | DemoMode | Run with an is_demo configuration. |
| Class | DisableTriggerFixture | Let tests disable database triggers. |