| /* |
| * Copyright 2020 The Android Open Source Project |
| * |
| * 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 androidx.compose.runtime.savedinstancestate |
| |
| import androidx.compose.mutableStateListOf |
| import androidx.test.filters.SmallTest |
| import com.google.common.truth.Truth.assertThat |
| import org.junit.Test |
| import org.junit.runner.RunWith |
| import org.junit.runners.JUnit4 |
| |
| @SmallTest |
| @RunWith(JUnit4::class) |
| class ListSaverTest { |
| |
| @Test |
| fun simpleSaveAndRestore() { |
| val original = Size(2, 3) |
| val saved = with(SizeSaver) { |
| allowingScope.save(original) |
| } |
| |
| assertThat(saved).isNotNull() |
| assertThat(SizeSaver.restore(saved!!)) |
| .isEqualTo(original) |
| } |
| |
| @Test(expected = IllegalArgumentException::class) |
| fun exceptionWhenAllItemsCantBeSaved() { |
| with(SizeSaver) { |
| disallowingScope.save(Size(2, 3)) |
| } |
| } |
| |
| @Test |
| fun customListIsTransformedToArrayList() { |
| val saver = listSaver<List<String>, String>(save = { it }, restore = { null }) |
| val scopeAllowingOnlyArrayListAndString = object : SaverScope { |
| override fun canBeSaved(value: Any) = value is ArrayList<*> || value is String |
| } |
| |
| val stateList = mutableStateListOf("One", "Two") |
| val savedList = with(saver) { |
| scopeAllowingOnlyArrayListAndString.save(stateList) |
| } |
| assertThat(savedList).isInstanceOf(ArrayList::class.java) |
| assertThat(savedList).isEqualTo(listOf("One", "Two")) |
| } |
| } |
| |
| private data class Size(val x: Int, val y: Int) |
| |
| private val SizeSaver = listSaver<Size, Int>( |
| save = { listOf(it.x, it.y) }, |
| restore = { Size(it[0], it[1]) } |
| ) |