I'm not sure why this extension is loading these two seemingly unrelated extensions.
Whatever the case, this is slowing down the mwext-testextension-zend job from 1-2 minutes to 9-12 minutes. And sometimes causing it to timeout due to database and filesystem contention (because limited resources in Labs, which is its own problem that speaks to the isolation of the unit tests and possibly utility of something like php vfsStream that could make it faster).