1 /* 2 * Copyright (C) 2025 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.compose 18 19 import androidx.compose.runtime.snapshots.Snapshot 20 import kotlinx.coroutines.test.TestScope 21 import kotlinx.coroutines.test.runTest 22 23 /** 24 * Runs the given test [block] in a [TestScope] that's set up such that the Compose snapshot state 25 * writes are properly applied to the global snapshot. This is for instance necessary if your test 26 * is using `snapshotFlow {}` or any other mechanism that is observing the global snapshot. 27 * 28 * Note that this isn't needed in a Compose test environment, e.g. if you use the 29 * `Compose(Content)TestRule`. 30 */ TestScopenull31fun TestScope.runTestWithSnapshots(block: suspend TestScope.() -> Unit) { 32 val handle = Snapshot.registerGlobalWriteObserver { Snapshot.sendApplyNotifications() } 33 34 try { 35 runTest { block() } 36 } finally { 37 handle.dispose() 38 } 39 } 40