test(splash): the initial destination is navigated to once

feature-splash/build.gradle

@@ -33,6 +33,7 @@ dependencies {
 
     testImplementation jUnitDep
     testImplementation mockitoDep
+    testImplementation project(':test-shared')
 
     implementation coroutinesDep
     implementation coroutinesAndroidDep

feature-splash/src/test/java/io/novafoundation/nova/splash/presentation/SplashViewModelTest.kt

@@ -0,0 +1,49 @@
+package io.novafoundation.nova.splash.presentation
+
+import io.novafoundation.nova.common.utils.splash.SplashPassedObserver
+import io.novafoundation.nova.feature_account_api.domain.interfaces.AccountRepository
+import io.novafoundation.nova.splash.SplashRouter
+import io.novafoundation.nova.test_shared.whenever
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.setMain
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+import org.mockito.Mockito.mock
+import org.mockito.Mockito.times
+import org.mockito.Mockito.verify
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class SplashViewModelTest {
+
+    private val router = mock(SplashRouter::class.java)
+    private val repository = mock(AccountRepository::class.java)
+    private val splashPassedObserver = mock(SplashPassedObserver::class.java)
+
+    @Before
+    fun setUp() {
+        Dispatchers.setMain(UnconfinedTestDispatcher())
+    }
+
+    @After
+    fun tearDown() {
+        Dispatchers.resetMain()
+    }
+
+    // The splash screen asks again on every onResume, including the one after the
+    // activity is recreated; navigating twice crashed the app on the welcome screen.
+    @Test
+    fun `navigates to the welcome screen once however often it is asked`() {
+        runBlocking { whenever(repository.isAccountSelected()).thenReturn(false) }
+        val viewModel = SplashViewModel(router, repository, splashPassedObserver)
+
+        viewModel.openInitialDestination()
+        viewModel.openInitialDestination()
+
+        verify(router, times(1)).openWelcomeScreen()
+    }
+}