I didn't realize there was any other way to interpret it besides "getting green (successful) results for all of the tests" (there are 8 test stages planned). I think we're both wrong though:

"The term “green” refers to the new hardware that will work together to power the stage, and “run” refers to operating all the components together simultaneously for the first time." --https://www.nasa.gov/exploration/systems/sls/green-run-test-...

I still think these tests should be run more than once though, the RS-25's were originally reusable anyway.