On: A git Primer

[_ikke_]

Maybe you have don this for brevity, but git branch does not create a new commit.

"The command’s second form creates a new branch head named <branchname> which points to the current HEAD, or <start-point> if given."

So after a git branch command, the test branch still points to the same commit as HEAD.

You have to make an additional commit for them to diverge.