1 /*
2  * Copyright (C) 2022 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.kotlin
18 
19 import android.testing.AndroidTestingRunner
20 import androidx.test.filters.SmallTest
21 import com.android.systemui.SysuiTestCase
22 import com.google.common.truth.Truth.assertThat
23 import kotlinx.coroutines.CompletableDeferred
24 import kotlinx.coroutines.async
25 import kotlinx.coroutines.awaitCancellation
26 import kotlinx.coroutines.runBlocking
27 import org.junit.Test
28 import org.junit.runner.RunWith
29 
30 @SmallTest
31 @RunWith(AndroidTestingRunner::class)
32 class RaceSuspendTest : SysuiTestCase() {
33     @Test
34     fun raceSimple() = runBlocking {
35         val winner = CompletableDeferred<Int>()
36         val result = async {
37             race(
38                 { winner.await() },
39                 { awaitCancellation() },
40             )
41         }
42         winner.complete(1)
43         assertThat(result.await()).isEqualTo(1)
44     }
45 
46     @Test
47     fun raceImmediate() = runBlocking {
48         assertThat(
49             race<Int>(
50                 { 1 },
51                 { 2 },
52             )
53         ).isEqualTo(1)
54     }
55 }
56