RxJava3 scheduler abstraction injected into the ViewModel to cover the test cases

RxSchedulerExampleViewModelImpl.kt

class ExampleViewModelImpl(
    private val exampleUseCase: ExampleUseCase,
    private val schedulerProvider: SchedulerProvider,
    initialState: ExampleState = ExampleState(),
) : HelpFaqViewModel(initialState) {
    ...
       exampleUseCase()
          .subscribeOn(schedulerProvider.io())
          .subscribe {

          }
          .addTo(disposable)
    ...

}

SchedulerProvider.kt

import io.reactivex.rxjava3.core.Scheduler

interface SchedulerProvider {
    fun io(): Scheduler
    fun computation(): Scheduler
    fun ui(): Scheduler
}

StandardSchedulerProvider.kt

import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
import io.reactivex.rxjava3.schedulers.Schedulers

class StandardSchedulerProvider : SchedulerProvider {
    override fun computation() = Schedulers.computation()
    override fun ui() = AndroidSchedulers.mainThread()
    override fun io() = Schedulers.io()
}

TestSchedulerProvider.kt

import io.reactivex.rxjava3.schedulers.TestScheduler

class TestSchedulerProvider(
    private val scheduler: TestScheduler,
) : SchedulerProvider {
    override fun computation() = scheduler
    override fun ui() = scheduler
    override fun io() = scheduler
}

TrampolineSchedulerProvider.kt

import io.reactivex.rxjava3.schedulers.Schedulers

class TrampolineSchedulerProvider : SchedulerProvider {
    override fun computation() = Schedulers.trampoline()
    override fun ui() = Schedulers.trampoline()
    override fun io() = Schedulers.trampoline()
}