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TasksViewModelTest to Kotlin
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‎app/src/test/java/com/example/android/architecture/blueprints/todoapp/tasks/TasksViewModelTest.java

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‎app/src/test/java/com/example/android/architecture/blueprints/todoapp/tasks/TasksViewModelTest.kt

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/*
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* Copyright 2016, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.architecture.blueprints.todoapp.tasks
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import com.example.android.architecture.blueprints.todoapp.data.Task
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import com.example.android.architecture.blueprints.todoapp.data.source.TasksRepository
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import com.example.android.architecture.blueprints.todoapp.util.schedulers.BaseSchedulerProvider
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import com.example.android.architecture.blueprints.todoapp.util.schedulers.ImmediateSchedulerProvider
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import com.google.common.collect.Lists
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import com.nhaarman.mockito_kotlin.any
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import io.reactivex.Completable
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import io.reactivex.Observable
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import io.reactivex.Single
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import io.reactivex.observers.TestObserver
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import org.junit.Before
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import org.junit.Test
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import org.mockito.Mock
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import org.mockito.Mockito.`when`
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import org.mockito.Mockito.verify
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import org.mockito.MockitoAnnotations
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/**
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* Unit tests for the implementation of [TasksViewModel]
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*/
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class TasksViewModelTest {
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@Mock
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private lateinit var tasksRepository: TasksRepository
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private lateinit var schedulerProvider: BaseSchedulerProvider
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private lateinit var tasksViewModel: TasksViewModel
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private lateinit var testObserver: TestObserver<TasksViewState>
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private lateinit var tasks: List<Task>
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@Before
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fun setupTasksViewModel() {
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// Mockito has a very convenient way to inject mocks by using the @Mock annotation. To
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// inject the mocks in the test the initMocks method needs to be called.
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MockitoAnnotations.initMocks(this)
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// Make the sure that all schedulers are immediate.
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schedulerProvider = ImmediateSchedulerProvider()
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// Get a reference to the class under test
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tasksViewModel = TasksViewModel(TasksActionProcessorHolder(tasksRepository, schedulerProvider))
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// We subscribe the tasks to 3, with one active and two completed
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tasks = Lists.newArrayList(
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Task(title = "Title1", description = "Description1", completed = false),
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Task(title = "Title2", description = "Description2", completed = true),
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Task(title = "Title3", description = "Description3", completed = true))
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testObserver = tasksViewModel.states().test()
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}
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@Test
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fun loadAllTasksFromRepositoryAndLoadIntoView() {
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// Given an initialized TasksViewModel with initialized tasks
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`when`(tasksRepository.getTasks(any())).thenReturn(Single.just(tasks))
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// When loading of Tasks is initiated
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tasksViewModel.processIntents(Observable.just(TasksIntent.InitialIntent.create()))
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// Then progress indicator state is emitted
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testObserver.assertValueAt(1, TasksViewState::isLoading)
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// Then progress indicator state is canceled and all tasks are emitted
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testObserver.assertValueAt(2) { tasksViewState -> !tasksViewState.isLoading }
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}
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@Test
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fun loadActiveTasksFromRepositoryAndLoadIntoView() {
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// Given an initialized TasksViewModel with initialized tasks
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`when`(tasksRepository.getTasks(any())).thenReturn(Single.just(tasks))
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// When loading of Tasks is initiated
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tasksViewModel.processIntents(
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Observable.just(TasksIntent.ChangeFilterIntent.create(TasksFilterType.ACTIVE_TASKS)))
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// Then progress indicator state is emitted
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testObserver.assertValueAt(1, TasksViewState::isLoading)
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// Then progress indicator state is canceled and all tasks are emitted
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testObserver.assertValueAt(2) { tasksViewState -> !tasksViewState.isLoading }
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}
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@Test
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fun loadCompletedTasksFromRepositoryAndLoadIntoView() {
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// Given an initialized TasksViewModel with initialized tasks
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`when`(tasksRepository.getTasks(any())).thenReturn(Single.just(tasks))
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// When loading of Tasks is requested
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tasksViewModel.processIntents(
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Observable.just(TasksIntent.ChangeFilterIntent.create(TasksFilterType.COMPLETED_TASKS)))
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// Then progress indicator state is emitted
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testObserver.assertValueAt(1, TasksViewState::isLoading)
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// Then progress indicator state is canceled and all tasks are emitted
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testObserver.assertValueAt(2) { tasksViewState -> !tasksViewState.isLoading }
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}
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@Test
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fun completeTask_ShowsTaskMarkedComplete() {
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// Given a stubbed task
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val task = Task(title = "Details Requested", description = "For this task")
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// And no tasks available in the repository
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`when`(tasksRepository.completeTask(task)).thenReturn(Completable.complete())
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`when`(tasksRepository.getTasks()).thenReturn(Single.just(emptyList()))
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// When task is marked as complete
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tasksViewModel.processIntents(Observable.just(TasksIntent.CompleteTaskIntent.create(task)))
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// Then repository is called and task marked complete state is emitted
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verify(tasksRepository).completeTask(task)
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verify(tasksRepository).getTasks()
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testObserver.assertValueAt(2, TasksViewState::taskComplete)
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}
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@Test
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fun activateTask_ShowsTaskMarkedActive() {
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// Given a stubbed completed task
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val task = Task(title = "Details Requested", description = "For this task", completed = true)
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// And no tasks available in the repository
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`when`(tasksRepository.activateTask(task)).thenReturn(Completable.complete())
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`when`(tasksRepository.getTasks()).thenReturn(Single.just(emptyList()))
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// When task is marked as activated
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tasksViewModel.processIntents(Observable.just(TasksIntent.ActivateTaskIntent.create(task)))
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// Then repository is called and task marked active state is emitted
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verify(tasksRepository).activateTask(task)
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verify(tasksRepository).getTasks()
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testObserver.assertValueAt(2, TasksViewState::taskActivated)
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}
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@Test
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fun errorLoadingTasks_ShowsError() {
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// Given that no tasks are available in the repository
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`when`(tasksRepository.getTasks(any())).thenReturn(Single.error(Exception()))
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// When tasks are loaded
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tasksViewModel.processIntents(Observable.just(TasksIntent.InitialIntent.create()))
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// Then an error containing state is emitted
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testObserver.assertValueAt(2) { state -> state.error() != null }
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}
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}

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