Re: [PATCH] t6016: move to lib-log-graph.sh framework

> 
> Glad to see others using `lib-log-graph.sh` as well!
> 
> The changes look alright to me but maybe you could have split the two
> changes into two different commits: Using tags directly instead of
> environment variables and using `check_graph` instead of manually
> `echo`-ing to an expected output and comparing with the actual output.
> 
> Other contributors would have a better idea whether it's truly required
> or not.
>