package io.oxygenhub.android

import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.test.TestDispatcher
import kotlinx.coroutines.test.UnconfinedTestDispatcher
import kotlinx.coroutines.test.resetMain
import kotlinx.coroutines.test.setMain
import org.junit.rules.TestWatcher
import org.junit.runner.Description

/** viewModelScope runs on Main: a test dispatcher stands in for it. */
@OptIn(ExperimentalCoroutinesApi::class)
class MainDispatcherRule(val dispatcher: TestDispatcher = UnconfinedTestDispatcher()) : TestWatcher() {
    override fun starting(description: Description) = Dispatchers.setMain(dispatcher)
    override fun finished(description: Description) = Dispatchers.resetMain()
}