// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.android.libraries.car.notifications

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

/** Coroutines Test Rule for testing coroutines calls */
@ExperimentalCoroutinesApi
class CoroutineTestRule(val testDispatcher: TestDispatcher = UnconfinedTestDispatcher()) :
  TestWatcher() {
  override fun starting(description: Description?) {
    super.starting(description)
    Dispatchers.setMain(testDispatcher)
  }

  override fun finished(description: Description?) {
    super.finished(description)
    Dispatchers.resetMain()
  }
}
