I wish I had know we were branching off of testing. That could have made more clear.
You'd taught us that in general we want to branch of master.
Rafael CastilloFront End Web Development Techdegree Student 8,328 Points
In this video/exercise you're not branching off of testing. You're creating a new branch (fix-nils) off of master. Rewatch the video starting at 1:23, he switches/checksout back to master from testing at that point before creating the new fix-nills branch and saving the corrections at that point.