Added tests to sample

gradle/libs.versions.toml

@@ -17,7 +17,8 @@ ktlint-gradle = "12.1.0"
 android-library = "8.3.1"
 maven-publish = "0.25.2"
 ui = "1.6.5"
-
+mockk = "1.13.10"
+mvi-kotest = "0.0.2"
 # its beeing used outside this file
 ktlint-lib = "1.2.1"
 
@@ -26,9 +27,10 @@ appcompat = { module = "androidx.appcompat:appcompat", version.ref = "appcompat"
 coroutinesCore = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "coroutines" }
 coroutinesTest = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test", version.ref = "coroutines" }
 kotestRunner = { module = "io.kotest:kotest-runner-junit5", version.ref = "kotest" }
-kotlinBom = { group = "org.jetbrains.kotlin", name = "kotlin-bom", version.ref = "kotlin" }
-mvi = { group = "com.adidas.mvi", name = "mvi", version.ref = "mvi" }
-mviCompose = { group = "com.adidas.mvi", name = "mvi-compose", version.ref = "mvi-compose" }
+kotlinBom = { module = "org.jetbrains.kotlin:kotlin-bom", version.ref = "kotlin" }
+mvi = { module = "com.adidas.mvi:mvi", version.ref = "mvi" }
+mviCompose = { module = "com.adidas.mvi:mvi-compose", version.ref = "mvi-compose" }
+mviKotest = { module = "com.adidas.mvi:mvi-kotest", version.ref = "mvi-kotest" }
 activityCompose = { module = "androidx.activity:activity-compose", version.ref = "activity" }
 lifecycleRuntimeCompose = { module = "androidx.lifecycle:lifecycle-runtime-compose", version.ref = "lifecycle" }
 material = { module = "androidx.compose.material:material", version.ref = "material" }
@@ -38,6 +40,7 @@ koinAndroid = { module = "io.insert-koin:koin-android", version.ref = "koin-andr
 koinAnnotations = { module = "io.insert-koin:koin-annotations", version.ref = "koin-annotations" }
 koinKspCompiler = { module = "io.insert-koin:koin-ksp-compiler", version.ref = "koin-annotations" }
 koinCompose = { module = "io.insert-koin:koin-androidx-compose", version.ref = "koin-compose" }
+mockk = { module = "io.mockk:mockk", version.ref = "mockk" }
 
 [plugins]
 kotlin = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }

mvi-sample/build.gradle.kts

@@ -50,6 +50,12 @@ android {
             applyKSP(this@configure, applicationVariants)
         }
     }
+
+    android.testOptions {
+        unitTests.all {
+            it.useJUnitPlatform()
+        }
+    }
 }
 
 private fun <T : BaseVariant> applyKSP(
@@ -83,4 +89,8 @@ dependencies {
     implementation(libs.koinAnnotations)
     implementation(libs.koinCompose)
     ksp(libs.koinKspCompiler)
+
+    testImplementation(libs.kotestRunner)
+    testImplementation(libs.mockk)
+    testImplementation(libs.mviKotest)
 }

mvi-sample/src/main/kotlin/com/adidas/mvi/sample/login/viewmodel/LoginViewModel.kt

@@ -8,6 +8,7 @@ import com.adidas.mvi.State
 import com.adidas.mvi.reducer.Reducer
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.flow
 
 internal class LoginViewModel(
@@ -48,7 +49,7 @@ internal class LoginViewModel(
     private fun executeLogin(intent: LoginIntent.Login) = flow {
         emit(LoginTransform.SetIsLoggingIn(isLoggingIn = true))
 
-        kotlinx.coroutines.delay(300)
+        delay(300)
 
         emit(LoginTransform.SetIsLoggingIn(isLoggingIn = false))
 

mvi-sample/src/test/kotlin/com/adidas/mvi/sample/login/viewmodel/CoroutineListener.kt

@@ -0,0 +1,26 @@
+package com.adidas.mvi.sample.login.viewmodel
+
+import io.kotest.core.listeners.TestListener
+import io.kotest.core.test.TestCase
+import io.kotest.core.test.TestResult
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.test.TestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.setMain
+
+@OptIn(ExperimentalCoroutinesApi::class)
+internal class CoroutineListener(
+    private val testCoroutineDispatcher: TestDispatcher,
+) : TestListener {
+
+    override suspend fun beforeContainer(testCase: TestCase) {
+        Dispatchers.setMain(testCoroutineDispatcher)
+    }
+
+    override suspend fun afterContainer(testCase: TestCase, result: TestResult) {
+        Dispatchers.resetMain()
+        testCoroutineDispatcher.scheduler.cancel()
+    }
+}

mvi-sample/src/test/kotlin/com/adidas/mvi/sample/login/viewmodel/LoginViewModelTest.kt

@@ -0,0 +1,59 @@
+package com.adidas.mvi.sample.login.viewmodel
+
+import com.adidas.mvi.kotest.GivenViewModel
+import io.kotest.core.spec.IsolationMode
+import io.kotest.core.spec.style.BehaviorSpec
+import io.kotest.matchers.shouldBe
+import io.mockk.mockk
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.TestCoroutineScheduler
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class LoginViewModelTest : BehaviorSpec({
+
+    isolationMode = IsolationMode.InstancePerLeaf
+
+    val testCoroutineDispatcher = UnconfinedTestDispatcher(TestCoroutineScheduler())
+    listeners(CoroutineListener(testCoroutineDispatcher))
+
+    fun getViewModel(): LoginViewModel {
+        return LoginViewModel(
+            logger = mockk(relaxed = true),
+            coroutineDispatcher = testCoroutineDispatcher
+        )
+    }
+
+    GivenViewModel(::getViewModel) {
+        When("no intent is executed") {
+            ThenState<LoginState.LoggedOut>()
+        }
+
+        WhenIntent(LoginIntent.Close) {
+            ThenState<LoginState.LoggedOut>(LoginSideEffect.Close)
+        }
+
+        WhenIntent(LoginIntent.Login("username", "password")) {
+
+            ThenState<LoginState.LoggedOut> { state ->
+                state.view.isLoggingIn shouldBe true
+            }
+
+            testCoroutineDispatcher.scheduler.advanceUntilIdle()
+
+            ThenState<LoginState.LoggedIn>()
+        }
+
+        WhenIntent(LoginIntent.Logout) {
+            ThenState<LoginState.LoggedOut>()
+        }
+
+        WhenIntent(LoginIntent.Login("", "")) {
+            testCoroutineDispatcher.scheduler.advanceUntilIdle()
+
+            ThenState<LoginState.LoggedOut>(LoginSideEffect.ShowInvalidCredentialsError)
+        }
+
+    }
+
+})