android - Android 单元测试数据存储
问题描述
我正在尝试为我的视图模型编写一个从数据存储中获取数据的测试,但我无法弄清楚。这是我的数据存储实现。当用户注册或登录时,我会保存用户数据,例如电子邮件和令牌:
class FlowAuthenticationDataStore(context: Context) : AuthenticationDataStore {
private val dataStore = context.createDataStore(name = "user_auth")
private val userEmailKey = preferencesKey<String>(name = "USER_EMAIL")
private val userTokenKey = preferencesKey<String>(name = "USER_TOKEN")
private val userNameKey = preferencesKey<String>(name = "USER_NAME")
private val userIsLoginKey = preferencesKey<Boolean>(name = "USER_IS_LOGIN")
override suspend fun updateUser(userDataStore: UserDataStoreModel) {
dataStore.edit {
it[userEmailKey] = userDataStore.email
it[userTokenKey] = userDataStore.token
it[userNameKey] = userDataStore.name
it[userIsLoginKey] = userDataStore.isLogin
}
}
override fun observeUser(): Flow<UserDataStoreModel> {
return dataStore.data.catch {
if (it is IOException) {
emit(emptyPreferences())
} else {
throw it
}
}.map {
UserDataStoreModel(
it[userIsLoginKey]!!,
it[userNameKey]!!,
it[userEmailKey]!!,
it[userTokenKey]!!
)
}
}
}
这是我的视图模型。我观察用户数据存储,如果它成功并且有数据,那么我会更新我的实时数据。如果没有数据并且用户是第一次注册,那么我的实时数据等于数据类的默认值:
class SplashScreenViewModel(
private val flowOnBoardingDataStore: FlowAuthenticationDataStore,
private val contextProvider: CoroutineContextProvider,
) :
ViewModel() {
private val _submitState = MutableLiveData<UserDataStoreModel>()
val submitState: LiveData<UserDataStoreModel> = _submitState
fun checkUserLogin() {
viewModelScope.launch {
kotlin.runCatching {
withContext(contextProvider.io) {
flowOnBoardingDataStore.observeUser().collect {
_submitState.value = it
}
}
}.onFailure {
_submitState.value = UserDataStoreModel()
}
}
}
}
这是我的测试课:
@ExperimentalCoroutinesApi
class SplashScreenViewModelTest {
private val dispatcher = TestCoroutineDispatcher()
@get:Rule
val rule = InstantTaskExecutorRule()
@get:Rule
val coroutineTestRule = CoroutineTestRule(dispatcher)
@RelaxedMockK
lateinit var flowOnBoardingDataStore: FlowAuthenticationDataStore
private fun createViewModel()=SplashScreenViewModel(flowOnBoardingDataStore,
CoroutineContextProvider(dispatcher,dispatcher)
)
@Before
fun setup() {
MockKAnnotations.init(this)
}
@After
fun tearDown() {
unmockkAll()
}
@Test
fun `when user is already sign in, then state should return model`()=dispatcher.runBlockingTest {
val viewModel=createViewModel()
val userDataStoreModel= UserDataStoreModel(true,"test","test","test")
flowOnBoardingDataStore.updateUser(userDataStoreModel)
viewModel.checkUserLogin()
assertEquals(userDataStoreModel,viewModel.submitState.value)
}
}
这是我的测试功能的结果:
junit.framework.AssertionFailedError:
Expected :UserDataStoreModel(isLogin=true, name=test, email=test, token=test)
Actual :null
解决方案
我找到了解决方案,并在此处发布以防万一有人需要它。该解决方案用于从用例coEvery
返回假数据flowOf
(您不需要使用flowOf
,它基于您从用例返回的数据,在我的情况下它是 return a flow
):
@Test
fun `when user is already sign in, then state should return user data`()=dispatcher.runBlockingTest {
val userData=UserDataStoreModel(true, Name,
Email,"","")
coEvery { authenticationDataStore.observeUser() }returns flowOf(userData)
val viewModel=createViewModel()
viewModel.checkUserLogin()
assertEquals(userData,viewModel.submitState.value)
}
这是完整的测试类:
@ExperimentalCoroutinesApi
class SplashScreenViewModelTest {
private val dispatcher = TestCoroutineDispatcher()
@get:Rule
val rule = InstantTaskExecutorRule()
@get:Rule
val coroutineTestRule = CoroutineTestRule(dispatcher)
@RelaxedMockK
lateinit var authenticationDataStore: AuthenticationDataStore
private fun createViewModel()=SplashScreenViewModel(authenticationDataStore,
CoroutineContextProvider(dispatcher,dispatcher)
)
@Before
fun setup() {
MockKAnnotations.init(this)
}
@After
fun tearDown() {
unmockkAll()
}
@Test
fun `when user is already sign in, then state should return user data`()=dispatcher.runBlockingTest {
val userData=UserDataStoreModel(true, Name,
Email,"","")
coEvery { authenticationDataStore.observeUser() }returns flowOf(userData)
val viewModel=createViewModel()
viewModel.checkUserLogin()
assertEquals(userData,viewModel.submitState.value)
}
}
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