TestScheduler doesn't use RxJavaPlugins.onSchedule hook

[Dimezis]

RxJava 2.2.20 and 3.0.7.
TestScheduler doesn't use RxJavaPlugins.onSchedule hook when scheduling tasks.
I believe this is an omission and it should respect the hooks just as other Schedulers do.

[akarnokd]

It was not meant to be hookable like the standard schedulers. What is your use case?

[Dimezis]

Long story short, to transfer the gRPC Context when scheduling the tasks with Rx Schedulers.
We replace the Schedulers with TestScheduler in some of our integration tests for timing control, but then the Context propagation breaks

[akarnokd]

I see.

There are currently no plans to change the TestScheduler in this regard. You can instead create a delegating Scheduler implementation backed by a TestScheduler and intercept any schedule* method calls on it and its Worker.