At least Phoenix is using it.
If you search in Phoenix repo, you would see a lot of classes with:

import org.apache.hadoop.hbase.HBaseTestingUtility;

If you have specific method(s) which you consider changing, you can ask
dev@phoenix.

FYI

On Fri, Jan 26, 2018 at 2:01 PM, Mike Drob <md...@apache.org> wrote:

> Can we make changes between releases? Do we know who else is using it?
>
> Mike
>

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