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Commit 8a876db

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Add test for flow use case 1
1 parent d481598 commit 8a876db

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3 files changed

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package com.lukaslechner.coroutineusecasesonandroid.usecases.flow.usecase1
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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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package com.lukaslechner.coroutineusecasesonandroid.usecases.flow.usecase1
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import androidx.arch.core.executor.testing.InstantTaskExecutorRule
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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.test.runTest
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import org.junit.Rule
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import org.junit.Test
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import org.junit.rules.TestRule
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class FlowUseCase1ViewModelTest {
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@get:Rule
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val testInstantTaskExecutorRule: TestRule = InstantTaskExecutorRule()
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@OptIn(ExperimentalCoroutinesApi::class)
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@get: Rule
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val replaceMainDispatcherRule = ReplaceMainDispatcherRule()
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private val receivedUiStates = mutableListOf<UiState>()
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@Test
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fun `should return success UI States with values of fakeDataSource`() = runTest {
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val fakeDataSource = FakeStockPriceDataSource()
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val viewModel = FlowUseCase1ViewModel(fakeDataSource)
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observeViewModel(viewModel)
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assertEquals(UiState.Loading, receivedUiStates[0])
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assertEquals(1, receivedUiStates.size)
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fakeDataSource.emit(listOf(googleStock, appleStock))
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assertEquals(UiState.Success(listOf(googleStock, appleStock)), receivedUiStates[1])
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assertEquals(2, receivedUiStates.size)
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fakeDataSource.emit(listOf(googleStock))
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assertEquals(UiState.Success(listOf(googleStock)), receivedUiStates[2])
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assertEquals(3, receivedUiStates.size)
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}
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private fun observeViewModel(viewModel: FlowUseCase1ViewModel) {
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viewModel.currentStockPriceAsLiveData.observeForever { uiState ->
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if (uiState != null) {
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receivedUiStates.add(uiState)
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}
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}
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}
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}
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package com.lukaslechner.coroutineusecasesonandroid.usecases.flow.usecase1
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import com.lukaslechner.coroutineusecasesonandroid.usecases.flow.mock.Stock
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val appleStock = Stock(
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rank = 1,
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name = "Apple",
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symbol = "AAPL",
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marketCap = 1.0f,
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country = "United Stated",
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currentPrice = 1.0f
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)
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val googleStock = Stock(
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rank = 4,
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name = "Alphabet",
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symbol = "GOOG",
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marketCap = 2.0f,
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country = "United Stated",
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currentPrice = 2.0f
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)

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