Last active
June 1, 2021 01:51
-
-
Save marcouberti/288a838a7f88a6b77d931e3d7d237ac4 to your computer and use it in GitHub Desktop.
Android Local Unit Test using Kotlin Coroutines and MockK. A CoroutineTestRule is needed if your tested classes use the Main dispatcher, otherwise an "IllegalStateException" is thrown. Also a InstantTaskExecutorRule is needed to avoid a "NullPointerException". Use runBlockingTest to skip all suspending delays. Use coEvery/coVerify to mock/verify…
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| dependencies { | |
| def kotlin_version = "1.3.61" | |
| implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version" | |
| implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.2" | |
| implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.0" | |
| ... | |
| testImplementation 'junit:junit:4.12' | |
| testImplementation 'org.json:json:20140107' | |
| // Koin testing tools | |
| testImplementation 'org.koin:koin-test:2.1.4' | |
| // MockK | |
| testImplementation "io.mockk:mockk:1.9.3" | |
| testImplementation "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version" | |
| testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.2") | |
| testImplementation "androidx.arch.core:core-testing:2.1.0" | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import org.junit.rules.TestWatcher | |
| import kotlinx.coroutines.Dispatchers | |
| import kotlinx.coroutines.ExperimentalCoroutinesApi | |
| import kotlinx.coroutines.test.* | |
| import org.junit.runner.Description | |
| @ExperimentalCoroutinesApi | |
| class CoroutineTestRule(val dispatcher: TestCoroutineDispatcher = TestCoroutineDispatcher()) : TestWatcher() { | |
| override fun starting(description: Description?) { | |
| super.starting(description) | |
| Dispatchers.setMain(dispatcher) | |
| } | |
| override fun finished(description: Description?) { | |
| super.finished(description) | |
| Dispatchers.resetMain() | |
| dispatcher.cleanupTestCoroutines() | |
| } | |
| fun runBlockingTest(block: suspend TestCoroutineScope.() -> Unit) = | |
| dispatcher.runBlockingTest { block() } | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| class SetupViewModelTest { | |
| @get:Rule | |
| val instantTaskExecutorRule = InstantTaskExecutorRule() | |
| @get:Rule | |
| val coroutineTestRule = CoroutineTestRule() | |
| /** | |
| * class under test | |
| */ | |
| lateinit var viewModel: SetupViewModel | |
| @MockK(relaxed = true) | |
| lateinit var setup : Setup | |
| @MockK(relaxed = true) | |
| lateinit var onboarding : Onboarding | |
| @MockK(relaxed = true) | |
| lateinit var welcome : Welcome | |
| @MockK(relaxed = true) | |
| lateinit var userManager : UserManager | |
| @MockK(relaxed = true) | |
| lateinit var repository : SetupRepository | |
| @Before | |
| fun before() { | |
| MockKAnnotations.init(this, relaxUnitFun = true) | |
| viewModel = SetupViewModel(setup, onboarding, welcome, userManager, repository) | |
| } | |
| @Test | |
| fun `test setup fails if settings fails`() = coroutineTestRule.runBlockingTest { | |
| every { setup.isComplete() } returns false | |
| coEvery { repository.getSetting() } returns Response.error(500, "".toResponseBody()) | |
| coEvery { repository.getMe() } returns Response.success(Me()) | |
| viewModel.initializeApp() | |
| // observe LiveData | |
| viewModel.errorDuringSetup.observeForever { error -> | |
| assertTrue(error) | |
| } | |
| } | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment