diff --git a/stress-linchk/src/test/scala/dev/tauri/choam/data/ManagedTestExample.scala b/stress-linchk/src/test/scala/dev/tauri/choam/data/ManagedTestExample.scala
index 6c7a4dadd..633dfc109 100644
--- a/stress-linchk/src/test/scala/dev/tauri/choam/data/ManagedTestExample.scala
+++ b/stress-linchk/src/test/scala/dev/tauri/choam/data/ManagedTestExample.scala
@@ -18,25 +18,20 @@
 package dev.tauri.choam
 package data
 
-import org.jetbrains.kotlinx.lincheck.LinChecker
+import org.jetbrains.kotlinx.lincheck.{ LinChecker, LincheckAssertionError }
 import org.jetbrains.kotlinx.lincheck.paramgen.IntGen
-import org.jetbrains.kotlinx.lincheck.verifier.VerifierState
 import org.jetbrains.kotlinx.lincheck.annotations.{ Operation, Param }
 import org.jetbrains.kotlinx.lincheck.strategy.managed.modelchecking.ModelCheckingOptions
 
 import munit.FunSuite
 
 @Param(name = "v", gen = classOf[IntGen], conf = "0:127")
-class ManagedTestState extends VerifierState {
+class ManagedTestState {
 
   @volatile
   private[this] var count: Int =
     0
 
-  override def extractState(): AnyRef = {
-    Integer.valueOf(this.count)
-  }
-
   @Operation
   def incr(v: Int): Int = {
     val curr = this.count
@@ -54,8 +49,14 @@ class ManagedTestState extends VerifierState {
 
 final class ManagedTestExample extends FunSuite with BaseLinchkSpec {
 
-  test("Dummy counter test".ignore) { // expected failure
+  test("Dummy counter test") {
     val opts = new ModelCheckingOptions()
-    LinChecker.check(classOf[ManagedTestState], opts)
+    try {
+      LinChecker.check(classOf[ManagedTestState], opts)
+      fail("expected a lincheck failure")
+    } catch {
+      case _: LincheckAssertionError =>
+        () // ok, expected failure
+    }
   }
 }
diff --git a/stress-linchk/src/test/scala/dev/tauri/choam/data/TtrieModelTest.scala b/stress-linchk/src/test/scala/dev/tauri/choam/data/TtrieModelTest.scala
index 55c8871b4..2a9092eec 100644
--- a/stress-linchk/src/test/scala/dev/tauri/choam/data/TtrieModelTest.scala
+++ b/stress-linchk/src/test/scala/dev/tauri/choam/data/TtrieModelTest.scala
@@ -20,7 +20,6 @@ package data
 
 import org.jetbrains.kotlinx.lincheck.LinChecker
 import org.jetbrains.kotlinx.lincheck.paramgen.StringGen
-import org.jetbrains.kotlinx.lincheck.verifier.VerifierState
 import org.jetbrains.kotlinx.lincheck.annotations.{ Operation, Param }
 
 import munit.FunSuite
@@ -46,7 +45,7 @@ final object TtrieModelTest {
 
   @Param(name = "k", gen = classOf[StringGen])
   @Param(name = "v", gen = classOf[StringGen])
-  class TestState extends VerifierState {
+  class TestState  {
 
     private[this] val emcas: mcas.Mcas =
       mcas.Mcas.Emcas
@@ -54,10 +53,6 @@ final object TtrieModelTest {
     private[this] val m: Ttrie[String, String] =
       Ttrie[String, String].unsafeRun(emcas)
 
-    override def extractState(): AnyRef = {
-      m.unsafeSnapshot.unsafeRun(emcas) : scala.collection.immutable.Map[String, String]
-    }
-
     @Operation
     def insert(k: String, v: String): Option[String] = {
       m.put.unsafePerform(k -> v, emcas)
diff --git a/stress-linchk/src/test/scala/dev/tauri/choam/data/TtrieStressTest.scala b/stress-linchk/src/test/scala/dev/tauri/choam/data/TtrieStressTest.scala
index ba3a557c0..716432828 100644
--- a/stress-linchk/src/test/scala/dev/tauri/choam/data/TtrieStressTest.scala
+++ b/stress-linchk/src/test/scala/dev/tauri/choam/data/TtrieStressTest.scala
@@ -20,7 +20,6 @@ package data
 
 import org.jetbrains.kotlinx.lincheck.LinChecker
 import org.jetbrains.kotlinx.lincheck.paramgen.StringGen
-import org.jetbrains.kotlinx.lincheck.verifier.VerifierState
 import org.jetbrains.kotlinx.lincheck.annotations.{ Operation, Param }
 import org.jetbrains.kotlinx.lincheck.strategy.stress.StressOptions
 
@@ -43,7 +42,7 @@ final class TtrieStressTest extends FunSuite with BaseLinchkSpec {
 final object TtrieStressTest {
 
   @Param(name = "k", gen = classOf[StringGen])
-  class TestState extends VerifierState {
+  class TestState {
 
     private[this] val emcas: mcas.Mcas =
       mcas.Mcas.Emcas
@@ -51,10 +50,6 @@ final object TtrieStressTest {
     private[this] val m: Ttrie[String, String] =
       Ttrie[String, String].unsafeRun(emcas)
 
-    override def extractState(): AnyRef = {
-      m.unsafeSnapshot.unsafeRun(emcas) : scala.collection.immutable.Map[String, String]
-    }
-
     @Operation
     def insert(k: String): Option[String] = {
       m.put.unsafePerform(k -> "dummy", emcas)
diff --git a/stress-linchk/src/test/scala/dev/tauri/choam/skiplist/SkipListModelTest.scala b/stress-linchk/src/test/scala/dev/tauri/choam/skiplist/SkipListModelTest.scala
index 2baa1518f..cad994a88 100644
--- a/stress-linchk/src/test/scala/dev/tauri/choam/skiplist/SkipListModelTest.scala
+++ b/stress-linchk/src/test/scala/dev/tauri/choam/skiplist/SkipListModelTest.scala
@@ -20,7 +20,6 @@ package skiplist
 
 import org.jetbrains.kotlinx.lincheck.LinChecker
 import org.jetbrains.kotlinx.lincheck.paramgen.{ IntGen, StringGen }
-import org.jetbrains.kotlinx.lincheck.verifier.VerifierState
 import org.jetbrains.kotlinx.lincheck.annotations.{ Operation, Param, StateRepresentation }
 
 import munit.FunSuite
@@ -79,15 +78,11 @@ final object SkipListModelTest {
 
   @Param(name = "key", gen = classOf[IntGen])
   @Param(name = "value", gen = classOf[StringGen])
-  class TestStateSequential extends VerifierState {
+  class TestStateSequential {
 
     private[this] val m =
       scala.collection.mutable.TreeMap.empty[Int, String]
 
-    override def extractState(): Map[Int, String] = {
-      m.toMap
-    }
-
     @StateRepresentation
     def stateRepr(): String = {
       m.toList.map {