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Commit a7194a2

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Add test for flow use case 4
1 parent 8a876db commit a7194a2

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3 files changed

+86
-1
lines changed

3 files changed

+86
-1
lines changed

‎app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/usecases/flow/usecase4/FlowUseCase4ViewModel.kt

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,7 @@ class FlowUseCase4ViewModel(
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stockPriceDataSource: StockPriceDataSource
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) : BaseViewModel<UiState>() {
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val currentStockPriceAsFlow: Flow<UiState> = stockPriceDataSource
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val currentStockPriceAsFlow: StateFlow<UiState> = stockPriceDataSource
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.latestStockList
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.map { stockList ->
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UiState.Success(stockList) as UiState
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@@ -0,0 +1,18 @@
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package com.lukaslechner.coroutineusecasesonandroid.usecases.flow.usecase4
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import com.lukaslechner.coroutineusecasesonandroid.usecases.flow.mock.Stock
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.MutableSharedFlow
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import kotlinx.coroutines.flow.asSharedFlow
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class FakeStockPriceDataSource : StockPriceDataSource {
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private val sharedFlow = MutableSharedFlow<List<Stock>>()
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suspend fun emit(stockList: List<Stock>) {
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sharedFlow.emit(stockList)
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}
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override val latestStockList: Flow<List<Stock>> = sharedFlow.asSharedFlow()
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}
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@@ -0,0 +1,67 @@
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package com.lukaslechner.coroutineusecasesonandroid.usecases.flow.usecase4
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import com.lukaslechner.coroutineusecasesonandroid.usecases.flow.usecase1.appleStock
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import com.lukaslechner.coroutineusecasesonandroid.usecases.flow.usecase1.googleStock
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import com.lukaslechner.coroutineusecasesonandroid.utils.ReplaceMainDispatcherRule
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import junit.framework.Assert.assertEquals
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import kotlinx.coroutines.ExperimentalCoroutinesApi
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import kotlinx.coroutines.flow.collect
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.test.UnconfinedTestDispatcher
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import kotlinx.coroutines.test.runTest
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import org.junit.Rule
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import org.junit.Test
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class FlowUseCase4ViewModelTest {
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@OptIn(ExperimentalCoroutinesApi::class)
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@get: Rule
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val replaceMainDispatcherRule = ReplaceMainDispatcherRule()
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@Test
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fun `should collect loading and success ui states on successful emissions`() = runTest {
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val fakeStockPriceDataSource = FakeStockPriceDataSource()
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val viewModel = FlowUseCase4ViewModel(fakeStockPriceDataSource)
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val collectJob =
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launch(UnconfinedTestDispatcher()) {
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viewModel.currentStockPriceAsFlow.collect()
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}
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assertEquals(
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UiState.Loading,
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viewModel.currentStockPriceAsFlow.value
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)
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fakeStockPriceDataSource.emit(
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listOf(
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googleStock,
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appleStock
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)
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)
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assertEquals(
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UiState.Success(
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listOf(
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googleStock,
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appleStock
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)
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),
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viewModel.currentStockPriceAsFlow.value
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)
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fakeStockPriceDataSource.emit(listOf(googleStock))
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assertEquals(
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UiState.Success(
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listOf(
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googleStock
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)
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),
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viewModel.currentStockPriceAsFlow.value
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)
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collectJob.cancel()
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}
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}

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