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Small fixes in MyModelViewModelTest #121

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Small fixes in MyModelViewModelTest #121

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b665b3d
Fix assertEquals calls so expected value comes first
kworth Oct 30, 2023
18841fb
Set test dispatcher and make Fake more flexible and dynamic
kworth Oct 30, 2023
0101d9a
Fix test so it does what its name implies
kworth Oct 30, 2023
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39 changes: 30 additions & 9 deletions app/src/test/java/android/template/ui/mymodel/MyModelViewModelTest.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -17,14 +17,22 @@
package android.template.ui.mymodel


import android.template.data.MyModelRepository
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.flow.first
import kotlinx.coroutines.flow.flow
import kotlinx.coroutines.flow.update
import kotlinx.coroutines.test.UnconfinedTestDispatcher
import kotlinx.coroutines.test.resetMain
import kotlinx.coroutines.test.runTest
import kotlinx.coroutines.test.setMain
import org.junit.After
import org.junit.Assert.assertEquals
import org.junit.Before
import org.junit.Test
import android.template.data.MyModelRepository

/**
* Example local unit test, which will execute on the development machine (host).
Expand All @@ -33,27 +41,40 @@ import android.template.data.MyModelRepository
*/
@OptIn(ExperimentalCoroutinesApi::class) // TODO: Remove when stable
class MyModelViewModelTest {

@Before
fun setUp() {
Dispatchers.setMain(UnconfinedTestDispatcher())
}

@After
fun tearDown() {
Dispatchers.resetMain()
}

@Test
fun uiState_initiallyLoading() = runTest {
val viewModel = MyModelViewModel(FakeMyModelRepository())
assertEquals(viewModel.uiState.first(), MyModelUiState.Loading)
assertEquals(MyModelUiState.Loading, viewModel.uiState.value)
assertEquals(MyModelUiState.Success(emptyList()), viewModel.uiState.first())
}

@Test
fun uiState_onItemSaved_isDisplayed() = runTest {
val viewModel = MyModelViewModel(FakeMyModelRepository())
assertEquals(viewModel.uiState.first(), MyModelUiState.Loading)
assertEquals(MyModelUiState.Success(emptyList()), viewModel.uiState.first())
viewModel.addMyModel("Compose")
assertEquals(MyModelUiState.Success(listOf("Compose")), viewModel.uiState.first())
}
}

private class FakeMyModelRepository : MyModelRepository {

private val data = mutableListOf<String>()
private val data = MutableStateFlow(emptyList<String>())

override val myModels: Flow<List<String>>
get() = flow { emit(data.toList()) }
override val myModels: StateFlow<List<String>> = data.asStateFlow()

override suspend fun add(name: String) {
data.add(0, name)
data.update { it.plus(name) }
}
}