Future Space
Starship prototype Ship 20 is conducting engine testing of its Raptor engines. A standard Raptor and a vacuum optimized Raptor engine (RVac) are currently installed on the vehicle. If the vacuum Raptor is tested, it would be the first time that a RVac is tested on a Starship. Exact test details are unconfirmed, but will potentially include preburner and static fire tests.
Credit NASASpaceflight