The MethodChannel code swallows exceptions and logs them to an error here:

https://github.com/flutter/engine/blob/661c24e4f359c60915a21c285d1d34777f0ccb30/shell/platform/android/io/flutter/plugin/common/MethodChannel.java#L205

This resulted in a recent regression(fixed in flutter/engine#9185 going unnoticed for over a day, even that we had a driver test triggering the bad code(as the exception was just logged).

We should make sure tests are failing when this happen(same for IncomingMethodCallHandler#onMessage).