Git branching example from Pro Git

Question

I'm going through the Pro Git book, trying to get my head around branching and merging in DVCS. So far it's been a great resource, but I'm having a little trouble with this section.

In Figure 3-8, we have the following:

The testing branch points to c2b9e, fine.

But then the author checks out master, commits a change, and suddenly it's master that's pointing to c2b9e, rather than testing:

I was expecting it to result in

HEAD -> master -> some_new_SHA -> f30ab

and

testing -> c2b9e -> f30ab

I'm having one of those "there's a bug in the compiler!" moments with this. There almost never is a bug in the compiler (the bug's in our own code, of course), so please help me see the error of my ways with this.

Answer 1

This is a bug in the illustration. Swap c2b9e and 87ab2 in the illustration and it's correct.