From Gerard Meszaros - http://xunitpatterns.com/Test%20Double%20Patterns.html.
| Name | Description |
| Dummy | Empty implementation. Not called or don’t care if it is |
| Stub | Canned replies - “snapshot in time” |
| Spy | Watches and Records |
| Fake | Partial Simulator |
| Mock | Has & Validates expectations |
| Saboteur | Designed to always fail, e.g., always throws an exception. |
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