diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/GTestLogger.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/GTestLogger.kt
index 7f3513e9785..a929d659e35 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/GTestLogger.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/GTestLogger.kt
@@ -5,6 +5,9 @@
 
 package kotlin.native.internal.test
 
+import kotlin.experimental.ExperimentalNativeApi
+
+@ExperimentalNativeApi
 internal class GTestLogger : TestLoggerWithStatistics() {
 
     private val Collection<TestSuite>.totalTestsNotIgnored: Int
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/Launcher.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/Launcher.kt
index 29befe90a18..e684921499c 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/Launcher.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/Launcher.kt
@@ -7,6 +7,7 @@
 
 package kotlin.native.internal.test
 
+import kotlin.experimental.ExperimentalNativeApi
 import kotlin.system.exitProcess
 import kotlin.native.concurrent.*
 
@@ -15,21 +16,24 @@ import kotlin.native.concurrent.*
 // So we keep this object public but protect it with @ExperimentalStdlibApi
 // to stress that it is not a part of the stable API.
 // Related YT issue: KT-47915.
-@ExperimentalStdlibApi
+@ExperimentalNativeApi
 @ThreadLocal
 public object GeneratedSuites {
    val suites = mutableListOf<TestSuite>()
    fun add(suite: TestSuite) = suites.add(suite)
 }
 
+@ExperimentalNativeApi
 public fun registerSuite(suite: TestSuite): Unit {
     GeneratedSuites.add(suite)
 }
 
+@ExperimentalNativeApi
 fun testLauncherEntryPoint(args: Array<String>): Int {
     return TestRunner(GeneratedSuites.suites, args).run()
 }
 
+@ExperimentalNativeApi
 fun main(args: Array<String>) {
     val exitCode = testLauncherEntryPoint(args)
     if (exitCode != 0) {
@@ -38,6 +42,7 @@ fun main(args: Array<String>) {
 }
 
 @OptIn(FreezingIsDeprecated::class)
+@ExperimentalNativeApi
 fun worker(args: Array<String>) {
     val worker = Worker.start()
     val exitCode = worker.execute(TransferMode.SAFE, { args.freeze() }) {
@@ -49,6 +54,7 @@ fun worker(args: Array<String>) {
     }
 }
 
+@ExperimentalNativeApi
 fun mainNoExit(args: Array<String>) {
     testLauncherEntryPoint(args)
 }
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TeamCityLogger.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TeamCityLogger.kt
index 984a0eca6f2..3c5946e1890 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TeamCityLogger.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TeamCityLogger.kt
@@ -5,8 +5,10 @@
 
 package kotlin.native.internal.test
 
+import kotlin.experimental.ExperimentalNativeApi
 import kotlin.text.StringBuilder
 
+@ExperimentalNativeApi
 internal class TeamCityLogger : BaseTestLogger() {
 
     private fun String.escapeForTC(): String = StringBuilder(length).apply {
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestListener.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestListener.kt
index 19eb544a61f..ccdfebefd63 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestListener.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestListener.kt
@@ -5,6 +5,9 @@
 
 package kotlin.native.internal.test
 
+import kotlin.experimental.ExperimentalNativeApi
+
+@ExperimentalNativeApi
 internal interface TestListener {
     fun startTesting(runner: TestRunner)
     fun finishTesting(runner: TestRunner, timeMillis: Long)
@@ -22,6 +25,7 @@ internal interface TestListener {
     fun ignore(testCase: TestCase)
 }
 
+@ExperimentalNativeApi
 internal open class BaseTestListener: TestListener {
     override fun startTesting(runner: TestRunner) {}
     override fun finishTesting(runner: TestRunner, timeMillis: Long) {}
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestLogger.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestLogger.kt
index ac2a5daf096..544e68f37a8 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestLogger.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestLogger.kt
@@ -5,11 +5,15 @@
 
 package kotlin.native.internal.test
 
+import kotlin.experimental.ExperimentalNativeApi
+
+@ExperimentalNativeApi
 internal interface TestLogger: TestListener {
     fun logTestList(runner: TestRunner, suites: Collection<TestSuite>)
     fun log(message: String)
 }
 
+@ExperimentalNativeApi
 internal open class BaseTestLogger: BaseTestListener(), TestLogger {
     override fun log(message: String) = println(message)
     override fun logTestList(runner: TestRunner, suites: Collection<TestSuite>) {
@@ -22,6 +26,7 @@ internal open class BaseTestLogger: BaseTestListener(), TestLogger {
     }
 }
 
+@ExperimentalNativeApi
 internal open class TestLoggerWithStatistics: BaseTestLogger() {
 
     protected val statistics = MutableTestStatistics()
@@ -36,12 +41,14 @@ internal open class TestLoggerWithStatistics: BaseTestLogger() {
     override fun ignore(testCase: TestCase) = statistics.registerIgnore(testCase)
 }
 
+@ExperimentalNativeApi
 internal class SilentTestLogger: BaseTestLogger() {
     override fun logTestList(runner: TestRunner, suites: Collection<TestSuite>) {}
     override fun log(message: String) {}
     override fun fail(testCase: TestCase, e: Throwable, timeMillis: Long) = e.printStackTrace()
 }
 
+@ExperimentalNativeApi
 internal class SimpleTestLogger: BaseTestLogger() {
     override fun startTesting(runner: TestRunner) = println("Starting testing")
     override fun finishTesting(runner: TestRunner, timeMillis: Long) = println("Testing finished")
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestRunner.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestRunner.kt
index 0751ff3439a..666202a5ff7 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestRunner.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestRunner.kt
@@ -5,12 +5,14 @@
 
 package kotlin.native.internal.test
 
+import kotlin.experimental.ExperimentalNativeApi
 import kotlin.IllegalArgumentException
 import kotlin.text.StringBuilder
 import kotlin.time.TimeSource
 import kotlin.time.measureTime
 
 @OptIn(kotlin.time.ExperimentalTime::class)
+@ExperimentalNativeApi
 internal class TestRunner(val suites: List<TestSuite>, args: Array<String>) {
     private val filters = mutableListOf<(TestCase) -> Boolean>()
     private val listeners = mutableSetOf<TestListener>()
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestStatistics.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestStatistics.kt
index c047c13a4cd..646c3dc0c40 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestStatistics.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestStatistics.kt
@@ -5,6 +5,9 @@
 
 package kotlin.native.internal.test
 
+import kotlin.experimental.ExperimentalNativeApi
+
+@ExperimentalNativeApi
 internal interface TestStatistics {
     val total: Int
     val passed: Int
@@ -17,6 +20,7 @@ internal interface TestStatistics {
     val hasFailedTests: Boolean
 }
 
+@ExperimentalNativeApi
 internal class MutableTestStatistics: TestStatistics {
 
     override var total:   Int = 0; private set
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestSuite.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestSuite.kt
index 5a9fe5dfc85..59480b6559b 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestSuite.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestSuite.kt
@@ -5,10 +5,12 @@
 
 package kotlin.native.internal.test
 
+import kotlin.experimental.ExperimentalNativeApi
 import kotlin.IllegalArgumentException
 import kotlin.system.getTimeMillis
 import kotlin.system.measureTimeMillis
 
+@ExperimentalNativeApi
 public interface TestCase {
     val name: String
     val ignored: Boolean
@@ -17,8 +19,10 @@ public interface TestCase {
     fun run()
 }
 
+@ExperimentalNativeApi
 internal val TestCase.prettyName get() = "${suite.name}.$name"
 
+@ExperimentalNativeApi
 public interface TestSuite {
     val name: String
     val ignored: Boolean
@@ -29,6 +33,7 @@ public interface TestSuite {
     fun doAfterClass()
 }
 
+@ExperimentalNativeApi
 public enum class TestFunctionKind {
     BEFORE_TEST,
     AFTER_TEST,
@@ -36,6 +41,7 @@ public enum class TestFunctionKind {
     AFTER_CLASS
 }
 
+@ExperimentalNativeApi
 public abstract class AbstractTestSuite<F: Function<Unit>>(override val name: String, override val ignored: Boolean)
     : TestSuite {
     override fun toString(): String = name
@@ -69,6 +75,7 @@ public abstract class AbstractTestSuite<F: Function<Unit>>(override val name: St
         get() = testCases.size
 }
 
+@ExperimentalNativeApi
 public abstract class BaseClassSuite<INSTANCE, COMPANION>(name: String, ignored: Boolean)
     : AbstractTestSuite<INSTANCE.() -> Unit>(name, ignored) {
 
@@ -134,6 +141,7 @@ public abstract class BaseClassSuite<INSTANCE, COMPANION>(name: String, ignored:
 
 private typealias TopLevelFun = () -> Unit
 
+@ExperimentalNativeApi
 public class TopLevelSuite(name: String): AbstractTestSuite<TopLevelFun>(name, false) {
 
     class TestCase(name: String, override val suite: TopLevelSuite, testFunction: TopLevelFun, ignored: Boolean)