diff --git a/app-shared-test/src/main/java/org/fnives/test/showcase/storage/migration/MigrationToLatestInstrumentedSharedTest.kt b/app-shared-test/src/main/java/org/fnives/test/showcase/storage/migration/MigrationToLatestInstrumentedSharedTest.kt
index 3c24451..7dbc095 100644
--- a/app-shared-test/src/main/java/org/fnives/test/showcase/storage/migration/MigrationToLatestInstrumentedSharedTest.kt
+++ b/app-shared-test/src/main/java/org/fnives/test/showcase/storage/migration/MigrationToLatestInstrumentedSharedTest.kt
@@ -24,7 +24,7 @@ import java.io.IOException
  * https://developer.android.com/training/data-storage/room/migrating-db-versions
  */
 @RunWith(AndroidJUnit4::class)
-open class MigrationToLatestInstrumentedSharedTest : KoinTest {
+abstract class MigrationToLatestInstrumentedSharedTest : KoinTest {
 
     @get:Rule
     val helper = SharedMigrationTestRule<LocalDatabase>(instrumentation = InstrumentationRegistry.getInstrumentation())
diff --git a/app-shared-test/src/main/java/org/fnives/test/showcase/ui/home/MainActivityInstrumentedSharedTest.kt b/app-shared-test/src/main/java/org/fnives/test/showcase/ui/home/MainActivityInstrumentedSharedTest.kt
index 798c9e7..e3fd1c2 100644
--- a/app-shared-test/src/main/java/org/fnives/test/showcase/ui/home/MainActivityInstrumentedSharedTest.kt
+++ b/app-shared-test/src/main/java/org/fnives/test/showcase/ui/home/MainActivityInstrumentedSharedTest.kt
@@ -23,7 +23,7 @@ import org.junit.rules.RuleChain
 import org.koin.test.KoinTest
 
 @Suppress("TestFunctionName")
-open class MainActivityInstrumentedSharedTest : KoinTest {
+abstract class MainActivityInstrumentedSharedTest : KoinTest {
 
     private lateinit var activityScenario: ActivityScenario<MainActivity>
 
diff --git a/app-shared-test/src/main/java/org/fnives/test/showcase/ui/login/AuthActivityInstrumentedSharedTest.kt b/app-shared-test/src/main/java/org/fnives/test/showcase/ui/login/AuthActivityInstrumentedSharedTest.kt
index 36725e5..99ba24f 100644
--- a/app-shared-test/src/main/java/org/fnives/test/showcase/ui/login/AuthActivityInstrumentedSharedTest.kt
+++ b/app-shared-test/src/main/java/org/fnives/test/showcase/ui/login/AuthActivityInstrumentedSharedTest.kt
@@ -18,7 +18,7 @@ import org.junit.rules.RuleChain
 import org.koin.test.KoinTest
 
 @Suppress("TestFunctionName")
-open class AuthActivityInstrumentedSharedTest : KoinTest {
+abstract class AuthActivityInstrumentedSharedTest : KoinTest {
 
     private lateinit var activityScenario: ActivityScenario<AuthActivity>
 
diff --git a/app-shared-test/src/main/java/org/fnives/test/showcase/ui/login/codekata/CodeKataAuthActivitySharedTest.kt b/app-shared-test/src/main/java/org/fnives/test/showcase/ui/login/codekata/CodeKataAuthActivitySharedTest.kt
index 07b66a0..eb94e63 100644
--- a/app-shared-test/src/main/java/org/fnives/test/showcase/ui/login/codekata/CodeKataAuthActivitySharedTest.kt
+++ b/app-shared-test/src/main/java/org/fnives/test/showcase/ui/login/codekata/CodeKataAuthActivitySharedTest.kt
@@ -14,7 +14,7 @@ import org.koin.test.KoinTest
 @OptIn(ExperimentalCoroutinesApi::class)
 @Ignore("CodeKata")
 @Suppress("EmptyFunctionBlock")
-open class CodeKataAuthActivitySharedTest : KoinTest {
+abstract class CodeKataAuthActivitySharedTest : KoinTest {
 
     @Before
     fun setup() {
diff --git a/app-shared-test/src/main/java/org/fnives/test/showcase/ui/splash/SplashActivityInstrumentedSharedTest.kt b/app-shared-test/src/main/java/org/fnives/test/showcase/ui/splash/SplashActivityInstrumentedSharedTest.kt
index f08761a..fbdde66 100644
--- a/app-shared-test/src/main/java/org/fnives/test/showcase/ui/splash/SplashActivityInstrumentedSharedTest.kt
+++ b/app-shared-test/src/main/java/org/fnives/test/showcase/ui/splash/SplashActivityInstrumentedSharedTest.kt
@@ -18,7 +18,7 @@ import org.junit.rules.RuleChain
 import org.koin.test.KoinTest
 
 @Suppress("TestFunctionName")
-open class SplashActivityInstrumentedSharedTest : KoinTest {
+abstract class SplashActivityInstrumentedSharedTest : KoinTest {
 
     private lateinit var activityScenario: ActivityScenario<SplashActivity>
 
diff --git a/codekata/sharedtests.instructionset.md b/codekata/sharedtests.instructionset.md
index 5bbb35c..b251e5b 100644
--- a/codekata/sharedtests.instructionset.md
+++ b/codekata/sharedtests.instructionset.md
@@ -39,7 +39,7 @@ Let's open `org.fnives.test.showcase.ui.login.codekata.CodeKataAuthActivityShare
 We can see it's identical as our original `org.fnives.test.showcase.ui.codekata.CodeKataAuthActivityInstrumentedTest`.
 So let's copy our existing code from the Robolectric test here. For that we can use the body of `org.fnives.test.showcase.ui.RobolectricAuthActivityInstrumentedTest`.
 
-Of course keep the `open` and the `CodeKataAuthActivitySharedTest` class name and package.
+Of course keep the `abstract`, the `CodeKataAuthActivitySharedTest` class name and package.
 We need to modify our robot:
 ```kotlin
 // Instead of this:
diff --git a/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/storage/migration/MigrationToLatestInstrumentedSharedTest.kt b/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/storage/migration/MigrationToLatestInstrumentedSharedTest.kt
index da60724..2f60e68 100644
--- a/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/storage/migration/MigrationToLatestInstrumentedSharedTest.kt
+++ b/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/storage/migration/MigrationToLatestInstrumentedSharedTest.kt
@@ -21,7 +21,8 @@ import java.io.IOException
  * https://developer.android.com/training/data-storage/room/migrating-db-versions
  */
 @RunWith(AndroidJUnit4::class)
-open class MigrationToLatestInstrumentedSharedTest {
+@Suppress("UnnecessaryAbstractClass")
+abstract class MigrationToLatestInstrumentedSharedTest {
 
     @get:Rule
     val helper = SharedMigrationTestRule<LocalDatabase>(instrumentation = InstrumentationRegistry.getInstrumentation())
diff --git a/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/NetworkSynchronizedActivityTest.kt b/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/NetworkSynchronizedActivityTest.kt
index ac61133..79b4679 100644
--- a/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/NetworkSynchronizedActivityTest.kt
+++ b/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/NetworkSynchronizedActivityTest.kt
@@ -7,7 +7,8 @@ import org.junit.Before
 import org.junit.Rule
 import javax.inject.Inject
 
-open class NetworkSynchronizedActivityTest {
+@Suppress("UnnecessaryAbstractClass")
+abstract class NetworkSynchronizedActivityTest {
 
     @Inject
     lateinit var networkSynchronizationHelper: NetworkSynchronizationHelper
diff --git a/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/auth/AuthActivityInstrumentedSharedTest.kt b/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/auth/AuthActivityInstrumentedSharedTest.kt
index f9b7327..aa7ce34 100644
--- a/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/auth/AuthActivityInstrumentedSharedTest.kt
+++ b/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/auth/AuthActivityInstrumentedSharedTest.kt
@@ -17,7 +17,7 @@ import org.junit.Test
 import org.junit.rules.RuleChain
 
 @Suppress("TestFunctionName")
-open class AuthActivityInstrumentedSharedTest : NetworkSynchronizedActivityTest() {
+abstract class AuthActivityInstrumentedSharedTest : NetworkSynchronizedActivityTest() {
 
     private lateinit var activityScenario: ActivityScenario<AuthActivity>
 
diff --git a/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/home/MainActivityInstrumentedSharedTest.kt b/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/home/MainActivityInstrumentedSharedTest.kt
index 128f468..c340211 100644
--- a/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/home/MainActivityInstrumentedSharedTest.kt
+++ b/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/home/MainActivityInstrumentedSharedTest.kt
@@ -23,7 +23,7 @@ import org.junit.Test
 import org.junit.rules.RuleChain
 
 @Suppress("TestFunctionName")
-open class MainActivityInstrumentedSharedTest : NetworkSynchronizedActivityTest() {
+abstract class MainActivityInstrumentedSharedTest : NetworkSynchronizedActivityTest() {
 
     private lateinit var activityScenario: ActivityScenario<MainActivity>
 
diff --git a/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/splash/SplashActivityInstrumentedSharedTest.kt b/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/splash/SplashActivityInstrumentedSharedTest.kt
index aeadbaa..3446238 100644
--- a/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/splash/SplashActivityInstrumentedSharedTest.kt
+++ b/hilt/hilt-app-shared-test/src/main/java/org/fnives/test/showcase/hilt/test/shared/ui/splash/SplashActivityInstrumentedSharedTest.kt
@@ -18,7 +18,7 @@ import org.junit.Test
 import org.junit.rules.RuleChain
 
 @Suppress("TestFunctionName")
-open class SplashActivityInstrumentedSharedTest : NetworkSynchronizedActivityTest() {
+abstract class SplashActivityInstrumentedSharedTest : NetworkSynchronizedActivityTest() {
 
     private lateinit var activityScenario: ActivityScenario<SplashActivity>