diff --git a/core/data/src/test/kotlin/com/google/samples/apps/nowinandroid/core/data/CompositeUserNewsResourceRepositoryTest.kt b/core/data/src/test/kotlin/com/google/samples/apps/nowinandroid/core/data/CompositeUserNewsResourceRepositoryTest.kt
index 05811f4be..cb921f155 100644
--- a/core/data/src/test/kotlin/com/google/samples/apps/nowinandroid/core/data/CompositeUserNewsResourceRepositoryTest.kt
+++ b/core/data/src/test/kotlin/com/google/samples/apps/nowinandroid/core/data/CompositeUserNewsResourceRepositoryTest.kt
@@ -24,6 +24,7 @@ import com.google.samples.apps.nowinandroid.core.model.data.mapToUserNewsResourc
 import com.google.samples.apps.nowinandroid.core.testing.repository.TestNewsRepository
 import com.google.samples.apps.nowinandroid.core.testing.repository.TestUserDataRepository
 import com.google.samples.apps.nowinandroid.core.testing.repository.emptyUserData
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.test.runTest
 import kotlinx.datetime.Instant
@@ -38,6 +39,7 @@ class CompositeUserNewsResourceRepositoryTest {
     private val userNewsResourceRepository = CompositeUserNewsResourceRepository(
         newsRepository = newsRepository,
         userDataRepository = userDataRepository,
+        defaultDispatcher = Dispatchers.Default,
     )
 
     @Test
diff --git a/core/domain/src/test/kotlin/com/google/samples/apps/nowinandroid/core/domain/GetFollowableTopicsUseCaseTest.kt b/core/domain/src/test/kotlin/com/google/samples/apps/nowinandroid/core/domain/GetFollowableTopicsUseCaseTest.kt
index 42a31f858..34bbfb756 100644
--- a/core/domain/src/test/kotlin/com/google/samples/apps/nowinandroid/core/domain/GetFollowableTopicsUseCaseTest.kt
+++ b/core/domain/src/test/kotlin/com/google/samples/apps/nowinandroid/core/domain/GetFollowableTopicsUseCaseTest.kt
@@ -22,6 +22,7 @@ import com.google.samples.apps.nowinandroid.core.model.data.Topic
 import com.google.samples.apps.nowinandroid.core.testing.repository.TestTopicsRepository
 import com.google.samples.apps.nowinandroid.core.testing.repository.TestUserDataRepository
 import com.google.samples.apps.nowinandroid.core.testing.util.MainDispatcherRule
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.test.runTest
 import org.junit.Rule
@@ -39,6 +40,7 @@ class GetFollowableTopicsUseCaseTest {
     val useCase = GetFollowableTopicsUseCase(
         topicsRepository,
         userDataRepository,
+        defaultDispatcher = Dispatchers.Default,
     )
 
     @Test
diff --git a/feature/bookmarks/src/test/kotlin/com/google/samples/apps/nowinandroid/feature/bookmarks/BookmarksViewModelTest.kt b/feature/bookmarks/src/test/kotlin/com/google/samples/apps/nowinandroid/feature/bookmarks/BookmarksViewModelTest.kt
index 6469a684b..f10205629 100644
--- a/feature/bookmarks/src/test/kotlin/com/google/samples/apps/nowinandroid/feature/bookmarks/BookmarksViewModelTest.kt
+++ b/feature/bookmarks/src/test/kotlin/com/google/samples/apps/nowinandroid/feature/bookmarks/BookmarksViewModelTest.kt
@@ -23,6 +23,7 @@ import com.google.samples.apps.nowinandroid.core.testing.repository.TestUserData
 import com.google.samples.apps.nowinandroid.core.testing.util.MainDispatcherRule
 import com.google.samples.apps.nowinandroid.core.ui.NewsFeedUiState.Loading
 import com.google.samples.apps.nowinandroid.core.ui.NewsFeedUiState.Success
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.test.UnconfinedTestDispatcher
@@ -46,6 +47,7 @@ class BookmarksViewModelTest {
     private val userNewsResourceRepository = CompositeUserNewsResourceRepository(
         newsRepository = newsRepository,
         userDataRepository = userDataRepository,
+        defaultDispatcher = Dispatchers.Default,
     )
     private lateinit var viewModel: BookmarksViewModel
 
diff --git a/feature/foryou/src/test/kotlin/com/google/samples/apps/nowinandroid/feature/foryou/ForYouViewModelTest.kt b/feature/foryou/src/test/kotlin/com/google/samples/apps/nowinandroid/feature/foryou/ForYouViewModelTest.kt
index b75573975..3c8a9785c 100644
--- a/feature/foryou/src/test/kotlin/com/google/samples/apps/nowinandroid/feature/foryou/ForYouViewModelTest.kt
+++ b/feature/foryou/src/test/kotlin/com/google/samples/apps/nowinandroid/feature/foryou/ForYouViewModelTest.kt
@@ -35,6 +35,7 @@ import com.google.samples.apps.nowinandroid.core.testing.util.TestAnalyticsHelpe
 import com.google.samples.apps.nowinandroid.core.testing.util.TestSyncManager
 import com.google.samples.apps.nowinandroid.core.ui.NewsFeedUiState
 import com.google.samples.apps.nowinandroid.feature.foryou.navigation.LINKED_NEWS_RESOURCE_ID
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.test.UnconfinedTestDispatcher
@@ -64,11 +65,13 @@ class ForYouViewModelTest {
     private val userNewsResourceRepository = CompositeUserNewsResourceRepository(
         newsRepository = newsRepository,
         userDataRepository = userDataRepository,
+        defaultDispatcher = Dispatchers.Default,
     )
 
     private val getFollowableTopicsUseCase = GetFollowableTopicsUseCase(
         topicsRepository = topicsRepository,
         userDataRepository = userDataRepository,
+        defaultDispatcher = Dispatchers.Default,
     )
     private val savedStateHandle = SavedStateHandle()
     private lateinit var viewModel: ForYouViewModel
diff --git a/feature/interests/src/test/kotlin/com/google/samples/apps/nowinandroid/interests/InterestsViewModelTest.kt b/feature/interests/src/test/kotlin/com/google/samples/apps/nowinandroid/interests/InterestsViewModelTest.kt
index c46cb7780..dab3035a8 100644
--- a/feature/interests/src/test/kotlin/com/google/samples/apps/nowinandroid/interests/InterestsViewModelTest.kt
+++ b/feature/interests/src/test/kotlin/com/google/samples/apps/nowinandroid/interests/InterestsViewModelTest.kt
@@ -24,6 +24,7 @@ import com.google.samples.apps.nowinandroid.core.testing.repository.TestUserData
 import com.google.samples.apps.nowinandroid.core.testing.util.MainDispatcherRule
 import com.google.samples.apps.nowinandroid.feature.interests.InterestsUiState
 import com.google.samples.apps.nowinandroid.feature.interests.InterestsViewModel
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.test.UnconfinedTestDispatcher
@@ -47,6 +48,7 @@ class InterestsViewModelTest {
     private val getFollowableTopicsUseCase = GetFollowableTopicsUseCase(
         topicsRepository = topicsRepository,
         userDataRepository = userDataRepository,
+        defaultDispatcher = Dispatchers.Default,
     )
     private lateinit var viewModel: InterestsViewModel