Graded F on resilience. In Vannus's assessment it has not disclosed which model it runs — a thin layer over someone else's foundation model.
Autonomous Java unit test generation. The vendor's documentation describes Cover as "a reinforcement learning AI platform that automatically writes comprehensive, human-like Java unit tests". Delivered as an IntelliJ IDE plugin, a CLI application, and CI integration, with additional components for test management and analytics. Java only.
Not disclosed. Diffblue Cover does not publish which model it runs, so this criterion is excluded and the grade rests on what we could verify. We say so rather than guess.
Not yet assessed. We publish a sovereignty position only where the vendor documents one — we do not infer it from a domain or a company name.
Vannus grades Diffblue Cover against nine dimensions of trust — data sovereignty, training privacy, compliance posture, operational resilience, exit portability, and more. The heaviest criterion asks whether the tool builds its own AI or resells someone else's model; where the vendor discloses it, the grade cites the vendor's own documentation. No paid placements — scoring is walled off from affiliate revenue. See the methodology →