Was it not clear from the story that she was able to review the code? It's GitHub… is this any better?

    Mary is naturally skeptical at first. The "old" Mary would never have 
    considered 
    performing a release without testing it on her laptop first! However, since 
    her 
    code has 100% test coverage and Josh is a reliable community member and she 
    can 
    ensure that the tests have passed and she is able to review the code sanity 
    and 
    security online via GitHub, she happily agrees to perform the release.