SpaceX Set to Test Raptor Engine Components at NASA Stennis, SpaceRef Business
"SpaceX has been working on the Raptor methane-fueled rocket engine since 2009. The new engine, a reusable engine is destined to be used in future versions of the Falcon Heavy and in the long term for the notional SpaceX Mars Colonial Transporter.
Testing is set to begin within the coming days after the E-2 test stand activation is completed a spokesperson for SpaceX confirmed to SpaceRef."