Yea, this is the only thing I don't like about them, that I can't test them locally.
More generally, is there something like a "on prem cloud" which just replicates say Cloud Tasks (but also other Cloud Apis) using local compute as well as say a local db. For testing / development this would be very cool.
Are there any open source implementations of Task Queues? It feels like something that has been missing for years.