1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.systemui.util.coroutines 18 19 import kotlinx.coroutines.Dispatchers 20 import kotlinx.coroutines.ExperimentalCoroutinesApi 21 import kotlinx.coroutines.test.TestDispatcher 22 import kotlinx.coroutines.test.resetMain 23 import kotlinx.coroutines.test.setMain 24 import org.junit.rules.TestWatcher 25 import org.junit.runner.Description 26 27 /** 28 * Overrides main dispatcher to passed testDispatcher. You probably want to use it when using 29 * viewModelScope which has hardcoded main dispatcher. 30 */ 31 @OptIn(ExperimentalCoroutinesApi::class) 32 class MainDispatcherRule(val testDispatcher: TestDispatcher) : TestWatcher() { startingnull33 override fun starting(description: Description) { 34 Dispatchers.setMain(testDispatcher) 35 } 36 finishednull37 override fun finished(description: Description) { 38 Dispatchers.resetMain() 39 } 40 } 41