The certification from both agencies is unusual. Another unusual feature of this engine is that CFM provided COMAC with a totally integrated propulsion system that includes the engine, nacelle, and thrust reverser.
While this news is welcome and should mean a first flight is coming soon, one needs to remember the engine was first flown on the GE test bed in 2014. Only recently were the engines run for 10 minutes on a C919. The equivalent engines for the MAX have been in flight test for some time and on the neo have started deliveries already. COMAC has fallen behind on the C919 and consequently is more dependent on the home market than ever.