chore: update observeOn tests to run mode (#6240)
chore: update observeOn tests to run mode (#6240)


martinsik/rxjs,ReactiveX/rxjs,benlesh/RxJS,ReactiveX/RxJS,ReactiveX/RxJS,ReactiveX/RxJS,ReactiveX/rxjs,benlesh/RxJS,martinsik/rxjs,martinsik/rxjs,martinsik/rxjs,ReactiveX/rxjs,benlesh/RxJS,ReactiveX/rxjs,benlesh/RxJS,ReactiveX/RxJS