diff --git a/app/src/robolectricTest/java/org/fnives/test/showcase/testutils/shadow/ShadowSnackbar.kt b/app/src/robolectricTest/java/org/fnives/test/showcase/testutils/shadow/ShadowSnackbar.kt
index f5d8193..2d4fc4d 100644
--- a/app/src/robolectricTest/java/org/fnives/test/showcase/testutils/shadow/ShadowSnackbar.kt
+++ b/app/src/robolectricTest/java/org/fnives/test/showcase/testutils/shadow/ShadowSnackbar.kt
@@ -29,7 +29,7 @@ class ShadowSnackbar {
         @Implementation
         @JvmStatic
         fun make(view: View, text: CharSequence, duration: Int): Snackbar? {
-            var snackbar: Snackbar? = null
+            val snackbar: Snackbar?
             try {
                 val constructor = Snackbar::class.java.getDeclaredConstructor(
                     Context::class.java,
diff --git a/app/src/test/java/org/fnives/test/showcase/ui/auth/CodeKataAuthViewModel.kt b/app/src/test/java/org/fnives/test/showcase/ui/auth/CodeKataAuthViewModel.kt
index eb996f2..74d65d2 100644
--- a/app/src/test/java/org/fnives/test/showcase/ui/auth/CodeKataAuthViewModel.kt
+++ b/app/src/test/java/org/fnives/test/showcase/ui/auth/CodeKataAuthViewModel.kt
@@ -1,5 +1,6 @@
 package org.fnives.test.showcase.ui.auth
 
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import org.fnives.test.showcase.core.login.LoginUseCase
 import org.fnives.test.showcase.testutils.InstantExecutorExtension
 import org.fnives.test.showcase.testutils.TestMainDispatcher
@@ -12,6 +13,7 @@ import org.mockito.kotlin.mock
 
 @Disabled("CodeKata")
 @ExtendWith(InstantExecutorExtension::class, TestMainDispatcher::class)
+@OptIn(ExperimentalCoroutinesApi::class)
 class CodeKataAuthViewModel {
 
     private lateinit var sut: AuthViewModel
diff --git a/core/src/test/java/org/fnives/test/showcase/core/content/AddContentToFavouriteUseCaseTest.kt b/core/src/test/java/org/fnives/test/showcase/core/content/AddContentToFavouriteUseCaseTest.kt
index 652a326..9b85438 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/content/AddContentToFavouriteUseCaseTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/content/AddContentToFavouriteUseCaseTest.kt
@@ -1,5 +1,6 @@
 package org.fnives.test.showcase.core.content
 
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.test.runTest
 import org.fnives.test.showcase.core.storage.content.FavouriteContentLocalStorage
@@ -17,6 +18,7 @@ import org.mockito.kotlin.verifyZeroInteractions
 import org.mockito.kotlin.whenever
 
 @Suppress("TestFunctionName")
+@OptIn(ExperimentalCoroutinesApi::class)
 internal class AddContentToFavouriteUseCaseTest {
 
     private lateinit var sut: AddContentToFavouriteUseCase
diff --git a/core/src/test/java/org/fnives/test/showcase/core/content/CodeKataContentRepositoryTest.kt b/core/src/test/java/org/fnives/test/showcase/core/content/CodeKataContentRepositoryTest.kt
index ee79ad0..3d78816 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/content/CodeKataContentRepositoryTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/content/CodeKataContentRepositoryTest.kt
@@ -1,5 +1,6 @@
 package org.fnives.test.showcase.core.content
 
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.test.runTest
 import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Disabled
@@ -7,6 +8,7 @@ import org.junit.jupiter.api.DisplayName
 import org.junit.jupiter.api.Test
 
 @Disabled("CodeKata")
+@OptIn(ExperimentalCoroutinesApi::class)
 class CodeKataContentRepositoryTest {
 
     @BeforeEach
diff --git a/core/src/test/java/org/fnives/test/showcase/core/content/ContentRepositoryTest.kt b/core/src/test/java/org/fnives/test/showcase/core/content/ContentRepositoryTest.kt
index eb24e76..8b1b7d7 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/content/ContentRepositoryTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/content/ContentRepositoryTest.kt
@@ -1,6 +1,7 @@
 package org.fnives.test.showcase.core.content
 
 import kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.async
 import kotlinx.coroutines.flow.take
 import kotlinx.coroutines.flow.toList
@@ -28,6 +29,7 @@ import org.mockito.kotlin.verifyNoMoreInteractions
 import org.mockito.kotlin.whenever
 
 @Suppress("TestFunctionName")
+@OptIn(ExperimentalCoroutinesApi::class)
 internal class ContentRepositoryTest {
 
     private lateinit var sut: ContentRepository
diff --git a/core/src/test/java/org/fnives/test/showcase/core/content/FetchContentUseCaseTest.kt b/core/src/test/java/org/fnives/test/showcase/core/content/FetchContentUseCaseTest.kt
index 46adab1..52722ce 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/content/FetchContentUseCaseTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/content/FetchContentUseCaseTest.kt
@@ -1,5 +1,6 @@
 package org.fnives.test.showcase.core.content
 
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.test.runTest
 import org.junit.jupiter.api.Assertions.assertThrows
@@ -15,6 +16,7 @@ import org.mockito.kotlin.verifyZeroInteractions
 import org.mockito.kotlin.whenever
 
 @Suppress("TestFunctionName")
+@OptIn(ExperimentalCoroutinesApi::class)
 internal class FetchContentUseCaseTest {
 
     private lateinit var sut: FetchContentUseCase
diff --git a/core/src/test/java/org/fnives/test/showcase/core/content/GetAllContentUseCaseTest.kt b/core/src/test/java/org/fnives/test/showcase/core/content/GetAllContentUseCaseTest.kt
index cca4a93..26cbeb6 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/content/GetAllContentUseCaseTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/content/GetAllContentUseCaseTest.kt
@@ -1,5 +1,6 @@
 package org.fnives.test.showcase.core.content
 
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.async
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.take
@@ -21,6 +22,7 @@ import org.mockito.kotlin.mock
 import org.mockito.kotlin.whenever
 
 @Suppress("TestFunctionName")
+@OptIn(ExperimentalCoroutinesApi::class)
 internal class GetAllContentUseCaseTest {
 
     private lateinit var sut: GetAllContentUseCase
diff --git a/core/src/test/java/org/fnives/test/showcase/core/content/RemoveContentFromFavouritesUseCaseTest.kt b/core/src/test/java/org/fnives/test/showcase/core/content/RemoveContentFromFavouritesUseCaseTest.kt
index 31fa1da..2ae0064 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/content/RemoveContentFromFavouritesUseCaseTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/content/RemoveContentFromFavouritesUseCaseTest.kt
@@ -1,5 +1,6 @@
 package org.fnives.test.showcase.core.content
 
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.test.runTest
 import org.fnives.test.showcase.core.storage.content.FavouriteContentLocalStorage
@@ -17,6 +18,7 @@ import org.mockito.kotlin.verifyZeroInteractions
 import org.mockito.kotlin.whenever
 
 @Suppress("TestFunctionName")
+@OptIn(ExperimentalCoroutinesApi::class)
 internal class RemoveContentFromFavouritesUseCaseTest {
 
     private lateinit var sut: RemoveContentFromFavouritesUseCase
diff --git a/core/src/test/java/org/fnives/test/showcase/core/content/TurbineContentRepositoryTest.kt b/core/src/test/java/org/fnives/test/showcase/core/content/TurbineContentRepositoryTest.kt
index 1e7e120..136de71 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/content/TurbineContentRepositoryTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/content/TurbineContentRepositoryTest.kt
@@ -2,6 +2,7 @@ package org.fnives.test.showcase.core.content
 
 import app.cash.turbine.test
 import kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.take
 import kotlinx.coroutines.flow.toList
 import kotlinx.coroutines.test.UnconfinedTestDispatcher
@@ -26,6 +27,7 @@ import org.mockito.kotlin.verify
 import org.mockito.kotlin.verifyNoMoreInteractions
 import org.mockito.kotlin.whenever
 
+@OptIn(ExperimentalCoroutinesApi::class)
 class TurbineContentRepositoryTest {
 
     private lateinit var sut: ContentRepository
diff --git a/core/src/test/java/org/fnives/test/showcase/core/content/TurbineGetAllContentUseCaseTest.kt b/core/src/test/java/org/fnives/test/showcase/core/content/TurbineGetAllContentUseCaseTest.kt
index 463be19..172a180 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/content/TurbineGetAllContentUseCaseTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/content/TurbineGetAllContentUseCaseTest.kt
@@ -1,6 +1,7 @@
 package org.fnives.test.showcase.core.content
 
 import app.cash.turbine.test
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.test.runTest
 import org.fnives.test.showcase.core.storage.content.FavouriteContentLocalStorage
@@ -17,6 +18,7 @@ import org.mockito.kotlin.doReturn
 import org.mockito.kotlin.mock
 import org.mockito.kotlin.whenever
 
+@OptIn(ExperimentalCoroutinesApi::class)
 class TurbineGetAllContentUseCaseTest {
 
     private lateinit var sut: GetAllContentUseCase
diff --git a/core/src/test/java/org/fnives/test/showcase/core/login/LoginUseCaseTest.kt b/core/src/test/java/org/fnives/test/showcase/core/login/LoginUseCaseTest.kt
index b06d399..43cfb72 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/login/LoginUseCaseTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/login/LoginUseCaseTest.kt
@@ -1,5 +1,6 @@
 package org.fnives.test.showcase.core.login
 
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.test.runTest
 import org.fnives.test.showcase.core.shared.UnexpectedException
 import org.fnives.test.showcase.core.storage.UserDataLocalStorage
@@ -23,6 +24,7 @@ import org.mockito.kotlin.verifyZeroInteractions
 import org.mockito.kotlin.whenever
 
 @Suppress("TestFunctionName")
+@OptIn(ExperimentalCoroutinesApi::class)
 internal class LoginUseCaseTest {
 
     private lateinit var sut: LoginUseCase
diff --git a/core/src/test/java/org/fnives/test/showcase/core/login/hilt/LogoutUseCaseTest.kt b/core/src/test/java/org/fnives/test/showcase/core/login/hilt/LogoutUseCaseTest.kt
index b9d817e..a3fa397 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/login/hilt/LogoutUseCaseTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/login/hilt/LogoutUseCaseTest.kt
@@ -1,5 +1,6 @@
 package org.fnives.test.showcase.core.login.hilt
 
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.test.runTest
 import org.fnives.test.showcase.core.content.ContentRepository
 import org.fnives.test.showcase.core.login.LogoutUseCase
@@ -16,6 +17,7 @@ import org.mockito.kotlin.verifyZeroInteractions
 import javax.inject.Inject
 
 @Suppress("TestFunctionName")
+@OptIn(ExperimentalCoroutinesApi::class)
 internal class LogoutUseCaseTest {
 
     @Inject
diff --git a/core/src/test/java/org/fnives/test/showcase/core/login/koin/LogoutUseCaseTest.kt b/core/src/test/java/org/fnives/test/showcase/core/login/koin/LogoutUseCaseTest.kt
index 6fc404f..1c125e7 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/login/koin/LogoutUseCaseTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/login/koin/LogoutUseCaseTest.kt
@@ -1,5 +1,6 @@
 package org.fnives.test.showcase.core.login.koin
 
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.test.runTest
 import org.fnives.test.showcase.core.content.ContentRepository
 import org.fnives.test.showcase.core.di.koin.createCoreModule
@@ -21,6 +22,7 @@ import org.mockito.kotlin.verifyNoMoreInteractions
 import org.mockito.kotlin.verifyZeroInteractions
 
 @Suppress("TestFunctionName")
+@OptIn(ExperimentalCoroutinesApi::class)
 internal class LogoutUseCaseTest : KoinTest {
 
     private lateinit var sut: LogoutUseCase
diff --git a/core/src/test/java/org/fnives/test/showcase/core/shared/AnswerUtilsKtTest.kt b/core/src/test/java/org/fnives/test/showcase/core/shared/AnswerUtilsKtTest.kt
index 0ce5312..ea9fd2f 100644
--- a/core/src/test/java/org/fnives/test/showcase/core/shared/AnswerUtilsKtTest.kt
+++ b/core/src/test/java/org/fnives/test/showcase/core/shared/AnswerUtilsKtTest.kt
@@ -1,6 +1,7 @@
 package org.fnives.test.showcase.core.shared
 
 import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.test.runTest
 import org.fnives.test.showcase.model.shared.Answer
@@ -12,6 +13,7 @@ import org.junit.jupiter.api.DisplayName
 import org.junit.jupiter.api.Test
 
 @Suppress("TestFunctionName")
+@OptIn(ExperimentalCoroutinesApi::class)
 internal class AnswerUtilsKtTest {
 
     @DisplayName("GIVEN network exception thrown WHEN wrapped into answer THEN answer error is returned")