| /* |
| * Copyright 2019 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.navigation |
| |
| import android.app.Application |
| import androidx.lifecycle.AndroidViewModel |
| import androidx.lifecycle.SavedStateHandle |
| import androidx.lifecycle.ViewModel |
| import androidx.lifecycle.ViewModelProvider |
| import androidx.lifecycle.ViewModelStore |
| import androidx.navigation.test.R |
| import androidx.navigation.testing.TestNavigator |
| import androidx.navigation.testing.test |
| import androidx.test.core.app.ApplicationProvider |
| import androidx.test.ext.junit.runners.AndroidJUnit4 |
| import androidx.test.filters.MediumTest |
| import com.google.common.truth.Truth.assertThat |
| import com.google.common.truth.Truth.assertWithMessage |
| import org.junit.Assert.fail |
| import org.junit.Test |
| import org.junit.runner.RunWith |
| |
| @MediumTest |
| @RunWith(AndroidJUnit4::class) |
| class NavBackStackEntryTest { |
| |
| @Test |
| fun testGetViewModelStoreOwner() { |
| val navController = createNavController() |
| navController.setViewModelStore(ViewModelStore()) |
| val navGraph = navController.navigatorProvider.navigation( |
| id = 1, |
| startDestination = R.id.start_test |
| ) { |
| test(R.id.start_test) |
| } |
| navController.setGraph(navGraph, null) |
| |
| val owner = navController.getViewModelStoreOwner(navGraph.id) |
| assertThat(owner).isNotNull() |
| val store = owner.viewModelStore |
| assertThat(store).isNotNull() |
| } |
| |
| @Test |
| fun testGetViewModelStoreOwnerAndroidViewModel() { |
| val navController = createNavController() |
| navController.setViewModelStore(ViewModelStore()) |
| val navGraph = navController.navigatorProvider.navigation( |
| id = 1, |
| startDestination = R.id.start_test |
| ) { |
| test(R.id.start_test) |
| } |
| navController.setGraph(navGraph, null) |
| |
| val owner = navController.getViewModelStoreOwner(navGraph.id) |
| assertThat(owner).isNotNull() |
| val viewModelProvider = ViewModelProvider(owner) |
| val viewModel = viewModelProvider[TestAndroidViewModel::class.java] |
| assertThat(viewModel).isNotNull() |
| } |
| |
| @Test |
| fun testGetViewModelStoreOwnerSavedStateViewModel() { |
| val hostStore = ViewModelStore() |
| val navController = createNavController() |
| navController.setViewModelStore(hostStore) |
| val navGraph = navController.navigatorProvider.navigation( |
| id = 1, |
| startDestination = R.id.start_test |
| ) { |
| test(R.id.start_test) |
| } |
| navController.setGraph(navGraph, null) |
| |
| val owner = navController.getViewModelStoreOwner(navGraph.id) |
| assertThat(owner).isNotNull() |
| val viewModelProvider = ViewModelProvider(owner) |
| val viewModel = viewModelProvider[TestSavedStateViewModel::class.java] |
| assertThat(viewModel).isNotNull() |
| viewModel.savedStateHandle.set("test", "test") |
| |
| val savedState = navController.saveState() |
| val restoredNavController = createNavController() |
| restoredNavController.setViewModelStore(hostStore) |
| restoredNavController.restoreState(savedState) |
| restoredNavController.graph = navGraph |
| |
| val restoredOwner = navController.getViewModelStoreOwner(navGraph.id) |
| val restoredViewModel = ViewModelProvider( |
| restoredOwner)[TestSavedStateViewModel::class.java] |
| val restoredState: String? = restoredViewModel.savedStateHandle.get("test") |
| assertThat(restoredState).isEqualTo("test") |
| } |
| |
| @Test |
| fun testSaveRestoreGetViewModelStoreOwner() { |
| val hostStore = ViewModelStore() |
| val navController = createNavController() |
| navController.setViewModelStore(hostStore) |
| val navGraph = navController.navigatorProvider.navigation( |
| id = 1, |
| startDestination = R.id.start_test |
| ) { |
| test(R.id.start_test) |
| } |
| navController.setGraph(navGraph, null) |
| |
| val store = navController.getViewModelStoreOwner(navGraph.id).viewModelStore |
| assertThat(store).isNotNull() |
| |
| val savedState = navController.saveState() |
| val restoredNavController = createNavController() |
| restoredNavController.setViewModelStore(hostStore) |
| restoredNavController.restoreState(savedState) |
| restoredNavController.graph = navGraph |
| |
| assertWithMessage("Restored NavController should return the same ViewModelStore") |
| .that(restoredNavController.getViewModelStoreOwner(navGraph.id).viewModelStore) |
| .isSameInstanceAs(store) |
| } |
| |
| @Test |
| fun testGetViewModelStoreOwnerNoGraph() { |
| val navController = createNavController() |
| navController.setViewModelStore(ViewModelStore()) |
| val navGraphId = 1 |
| |
| try { |
| navController.getViewModelStoreOwner(navGraphId) |
| fail( |
| "Attempting to get ViewModelStoreOwner for navGraph not on back stack should " + |
| "throw IllegalArgumentException" |
| ) |
| } catch (e: IllegalArgumentException) { |
| assertThat(e) |
| .hasMessageThat().contains( |
| "No destination with ID $navGraphId is on the NavController's back stack" |
| ) |
| } |
| } |
| |
| @Test |
| fun testGetViewModelStoreOwnerSameGraph() { |
| val navController = createNavController() |
| navController.setViewModelStore(ViewModelStore()) |
| val provider = navController.navigatorProvider |
| val graph = provider.navigation(1, startDestination = 1) { |
| navigation(1, startDestination = 2) { |
| test(2) |
| } |
| } |
| |
| navController.setGraph(graph, null) |
| val owner = navController.getViewModelStoreOwner(graph.id) |
| assertThat(owner).isNotNull() |
| val viewStore = owner.viewModelStore |
| assertThat(viewStore).isNotNull() |
| |
| val sameGraphOwner = navController.getViewModelStoreOwner(graph.id) |
| assertThat(sameGraphOwner).isSameInstanceAs(owner) |
| assertThat(sameGraphOwner.viewModelStore).isSameInstanceAs(viewStore) |
| } |
| |
| private fun createNavController(): NavController { |
| val navController = NavController(ApplicationProvider.getApplicationContext()) |
| val navigator = TestNavigator() |
| navController.navigatorProvider.addNavigator(navigator) |
| return navController |
| } |
| } |
| |
| class TestAndroidViewModel(application: Application) : AndroidViewModel(application) |
| |
| class TestSavedStateViewModel(val savedStateHandle: SavedStateHandle) : ViewModel() |
