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.kosmos 18 19 import androidx.test.ext.junit.runners.AndroidJUnit4 20 import androidx.test.filters.SmallTest 21 import com.android.systemui.SysuiTestCase 22 import com.google.common.truth.Truth.assertThat 23 import kotlinx.coroutines.flow.MutableStateFlow 24 import kotlinx.coroutines.flow.SharingStarted 25 import kotlinx.coroutines.flow.flow 26 import kotlinx.coroutines.flow.map 27 import kotlinx.coroutines.flow.stateIn 28 import kotlinx.coroutines.test.runTest 29 import org.junit.Test 30 import org.junit.runner.RunWith 31 32 @SmallTest 33 @RunWith(AndroidJUnit4::class) 34 class GeneralKosmosTest : SysuiTestCase() { 35 @Test <lambda>null36 fun stateCurrentValueMutableStateFlow() = runTest { 37 val source = MutableStateFlow(1) 38 val mapped = 39 source 40 .map { it * 2 } 41 .stateIn( 42 scope = backgroundScope, 43 started = SharingStarted.WhileSubscribed(), 44 initialValue = source.value * 2, 45 ) 46 assertThat(currentValue(mapped)).isEqualTo(2) 47 48 source.value = 3 49 assertThat(currentValue(mapped)).isEqualTo(6) 50 } 51 52 @Test <lambda>null53 fun stateCurrentValueOnEmittedFlow() = runTest { 54 val source = flow { 55 emit(1) 56 emit(2) 57 } 58 val mapped = 59 source 60 .map { it * 2 } 61 .stateIn( 62 scope = backgroundScope, 63 started = SharingStarted.WhileSubscribed(), 64 initialValue = 2, 65 ) 66 assertThat(currentValue(mapped)).isEqualTo(4) 67 } 68 69 @Test <lambda>null70 fun currentValueIsNull() = runTest { 71 val source = MutableStateFlow<Int?>(null) 72 assertThat(currentValue(source)).isEqualTo(null) 73 } 74 } 75